List of animals by number of neurons

The following are two lists of animals ordered by the size of their nervous system. The first list shows number of neurons in their entire nervous system, indicating their overall neural complexity. The second list shows the number of neurons in the structure that has been found to be representative of animal intelligence.[1] The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex.[2][1]

Brief comparisons of number of whole brain neurons (top) and cerebral cortex neurons (bottom) among six mammals.

OverviewEdit

Neurons are the cells that transmit information in an animal's nervous system so that it can sense stimuli from its environment and behave accordingly. Not all animals have neurons; Trichoplax and sponges lack nerve cells altogether.

Neurons may be packed to form structures such as the brain of vertebrates or the neural ganglions of insects.

The number of neurons and their relative abundance in different parts of the brain is a determinant of neural function and, consequently, of behavior.

Whole nervous systemEdit

All numbers for neurons (except Caenorhabditis and Ciona), and all numbers for synapses (except Ciona) are estimations.

Name Neurons in the brain & whole nervous system Synapses Details Image Source
Sponge 0 [3]
Trichoplax 0 Despite no nervous system, it exhibits coordinated feeding and response behaviors.[4] [5]
Asplanchna brightwellii (rotifer) about 200 Brain only [6]
Tardigrade about 200 Brain only [7]
Ciona intestinalis larva (sea squirt) 231 8,617 (central nervous system only) [8]

[9]

Caenorhabditis elegans (roundworm) 302 ~7,500 is the only organism to have its whole connectome (neuronal "wiring diagram") completed.[10][11][12] [13]
Jellyfish 5,600 Hydra vulgaris (H. attenuate) [14]
Megaphragma mymaripenne 7,400 [15]
Box jellyfish 8,70017,500 adult Tripedalia cystophora (8 mm diameter) – does not include 1000 neurons in each of the four rhopalia [16]
Medicinal leech 10,000 [17]
Pond snail 11,000 [18]
Sea slug 18,000 [19]
Amphioxus 20,000 central nervous system only [20]

[21]

Larval zebrafish 100,000 [22]
Lobster 100,000 [23]
Fruit fly 100,000 < 10,000,000[citation needed] [24]
Wandering spider 100,000 [25]
Calliopsis (bee) 234,000 [26]
Ant 250,000 Varies per species [27]
Perdita (genus) 275,000 [26]
Melissodes 495,000 [26]
Bombus impatiens 557,000 [26]
Western honey bee 613,000 [26]
Honey bee 960,000 ~1×10^9 [28]
Cockroach 1,000,000 [29]
Coconut crab >1,000,000 c. 1,000,000 interneurons are dedicated to analysing olfactory input alone. [30]
California carpenter bee 1,180,000 [26]
Anolis cristatellus 4,270,000 [31]
Guppy 4,300,000 [32]
Ocelot gecko 4,420,000 [33]
Anolis evermanni 4,920,000 [31]
Adult zebrafish ~10,000,000 cells (neurons + other) [34]
Frog 16,000,000 [35]
Naked mole-rat 26,880,000 [36]
Little free-tailed bat 35,000,000 [37]
Smoky shrew 36,000,000 [38]
Short-tailed shrew 52,000,000 [38]
Common bent-wing bat 56,000,000 [37]
African sheath-tailed bat 59,000,000 [37]
Hottentot golden mole 65,000,000 [39]
Woermann's bat 66,000,000 [37]
Zenker's fruit bat 66,000,000 [37]
Commerson's roundleaf bat 67,000,000 [37]
Rufous trident bat 70,000,000 [37]
House mouse 71,000,000 ~1×10^12 [40]
Nile crocodile 80,500,000 [41]
Heart-nosed bat 81,000,000 [37]
Golden hamster 90,000,000 [40]
Short-palated fruit bat 99,000,000 [37]
Ansell's mole-rat 103,000,000 [42]
Mashona mole-rat 113,000,000 [42]
Hairy-tailed mole 124,000,000 [39]
Eastern rock elephant shrew 129,000,000 [39]
Star-nosed mole 131,000,000 [38]
Zebra finch 131,000,000 Brain only [43]
Silvery mole-rat 148,000,000 [42]
Four-toed elephant shrew 157,000,000 [39]
Eurasian blackcap 157,000,000 [43]
Wahlberg's epauletted fruit bat 162,000,000 [37]
Goldcrest 164,000,000 [43]
Cape mole-rat 170,000,000 [42]
Egyptian fruit bat 172,000,000 [37]
Mechow's mole-rat 174,000,000 [42]
Damaraland mole-rat 178,000,000 [42]
Franquet's epauletted fruit bat 186,000,000 [37]
Brown rat 200,000,000 ~4.48×10^11 [44]
Guyenne spiny rat 202,000,000 [39]
Eastern mole 204,000,000 [38]
Red junglefowl 221,000,000 [43]
Great tit 226,000,000 [43]
Green-rumped parrotlet 227,000,000 [43]
Guinea pig 240,000,000 [40]
Gray mouse lemur 254,710,000 [45]
Common treeshrew 261,000,000 [46]
Hammer-headed bat 275,000,000 [37]
Pigeon 310,000,000 Brain only [43]
Budgerigar 322,000,000 [43]
Cape dune mole-rat 361,000,000 [42]
Common blackbird 379,000,000 [43]
Ferret 404,000,000 [47]
Cockatiel 453,000,000 [43]
Gray squirrel 453,660,000 [36]
Banded mongoose 454,000,000 [47]
Prairie dog 473,940,000 [36]
Common starling 483,000,000 [43]
European rabbit 494,200,000 [36]
Octopus 500,000,000 [48]
Western tree hyrax 505,000,000 [39]
Common marmoset 636,000,000 [46]
Eastern rosella 642,000,000 [43]
Barn owl 690,000,000 [43]
Monk parakeet 697,000,000 [43]
Azure-winged magpie 741,000,000 [43]
Rock hyrax 756,000,000 [39]
Cat 760,000,000 ~1×10^13 [49]
Black-rumped agouti 857,000,000 [40]
Magpie 897,000,000 [43]
Common hill myna 906,000,000 [43]
Northern greater galago 936,000,000 [46]
Western jackdaw 968,000,000 [43]
Eurasian jay 1.085×10^9 [43]
Alexandrine parakeet 1.096×10^9 [43]
Raccoon dog 1.16×10^9 [50]
Tanimbar corella 1.161×10^9 [43]
Emu 1.335×10^9 [43]
Three-striped night monkey 1.468×10^9 [46]
Rook 1.509×10^9 [43]
Grey parrot 1.566×10^9 [43]
Capybara 1.6×10^9 [40]
Jackal 1.73×10^9 [50]
Fox 2.11×10^9 [50]
Sulphur-crested cockatoo 2.122×10^9 [43]
Raccoon 2.148×10^9 [47]
Kea 2.149×10^9 [43]
Raven 2.171×10^9 Brain only [43]
Domestic pig 2.22×10^9 [51]
Dog 2.253×10^9 [47]
Chihuahua (dog) 2.51×10^9 [50]
Dog (Chow Chow) 2.61×10^9 [50]
Dog (Yorkshire Terrier) 2.64×10^9 [50]
Springbok 2.72×10^9 [51]
Dog (West Highland White Terrier) 2.83×10^9 [50]
Blesbok 3.06×10^9 [51]
Blue-and-yellow macaw 3.136×10^9 Brain only [43]
Common squirrel monkey 3.246×10^9 [46]
Crab-eating macaque 3.44×10^9 [45]
Dog (German Shepherd) 3.53×10^9 [50]
Tufted capuchin 3.691×10^9 [46]
Bonnet macaque 3.78×10^9 [45]
Striped hyena 3.885×10^9 [47]
Dog (Komondor) 3.99×10^9 [50]
Dog (Transylvanian Hound) 4.39×10^9 [50]
Lion 4.667×10^9 [47]
Greater kudu 4.91×10^9 [51]
Rhesus macaque 6.376×10^9 [46]
Brown bear 9.586×10^9 [47]
Giraffe 1.075×10^10 [51]
Yellow baboon 1.095×10^10 [45]
Chimpanzee 2.8×10^10 [52]
Orangutan 3.26×10^10 [53]
Gorilla 3.34×10^10 [53]
Human 8.6×10^10 ~1.5×10^14 Neurons for average adult [54][55][56]
African elephant 2.57×10^11 [57][58]

List of animal species by forebrain (cerebrum or pallium) neuron numberEdit

The question of what physical characteristic of an animal makes an animal intelligent has varied over the centuries. One early speculation was brain size (or weight, which provides the same ordering.) A second proposal was brain-to-body-mass ratio, and a third was encephalization quotient, sometimes referred to as EQ. The current best predictor is number of neurons in the forebrain, based on Herculano-Houzel's improved neuron counts.[1] It accounts most accurately for variations in dependence on the cerebellum. The elephant depends on its exceptionally large cerebellum, while birds make do with a much smaller one.

Differing methods have been used to count neurons and these may differ in degree of reliability. These are the optical fractionator, an application of stereology and the isotropic fractionator, a recent methodological innovation. Most numbers in the list are the result of studies using the newer isotropic fractionator.[1][36][26][40][41][43][44][45][46][51][52][53][54][55][57][59] A variation of the optical fractionator was responsible for the previous total human brain neuron count of 100,000,000,000 neurons, which has been revised down to 86,000,000,000 by the use of the isotropic fractionator. This is in part why it may be considered to be less reliable. Finally, some numbers are the result of estimations based on correlations observed between number of cortical neurons and brain mass within closely related taxa.

The following table gives information on the number of neurons estimated to be in the sensory-associative structure (such as the pallium).

Common name Average number of sensory-associative structure neurons[a] Intraspecific variation[b] Method[c] Sensory-associative structure Binomial nomenclature Image Source
Common fruit fly 2,500* Optical fractionator Corpora pedunculata Drosophila melanogaster [60]
House cricket 50,000* Optical fractionator Corpora pedunculata Acheta domesticus [60]
Honey bee 170,000* Optical fractionator Corpora pedunculata Genus: Apis [60]
Common cockroach 200,000* Optical fractionator Corpora pedunculata Genus: Periplaneta [60]
African sheath-tailed bat 5,000,000 Isotropic fractionator Pallium (cortex) Coleura afra [37]
Rufous trident bat 6,000,000 Isotropic fractionator Pallium (cortex) Triaenops persicus [37]
Naked mole-rat 6,000,000 ± 1,065,587[39] Isotropic fractionator Pallium (cortex) Heterocephalus glaber [36]
Little free-tailed bat 6,000,000 Isotropic fractionator Pallium (cortex) Chaerephon pumilus [37]
Common bent-wing bat 6,000,000 Isotropic fractionator Pallium (cortex) Miniopterus schreibersii [37]
Commerson's roundleaf bat 8,000,000 Isotropic fractionator Pallium (cortex) Hipposideros commersoni [37]
Heart-nosed bat 10,000,000 Isotropic fractionator Pallium (cortex) Cardioderma cor [37]
Ansell's mole-rat 10,000,000 Isotropic fractionator Pallium (cortex) Fukomys anselli [42]
Smoky shrew 10,000,000 ± 352,000[39] Isotropic fractionator Pallium (cortex) Sorex fumeus [39]
Short-palated fruit bat 10,000,000 Isotropic fractionator Pallium (cortex) Casinycteris argynnis [37]
Mashona mole-rat 12,000,000 Isotropic fractionator Pallium (cortex) Fukomys darlingi [42]
Woermann's bat 12,000,000 Isotropic fractionator Pallium (cortex) Megaloglossus woermanni [37]
Northern short-tailed shrew 12,000,000 ± 1,569,000[39] Isotropic fractionator Pallium (cortex) Blarina brevicauda [39]
Zenker's fruit bat 13,000,000 Isotropic fractionator Pallium (cortex) Scotonycteris zenkeri [37]
House mouse 14,000,000 ± 2,242,257[39] Isotropic fractionator Pallium (cortex) Mus musculus [39]
Hairy-tailed mole 16,000,000 ± 2,611,000[39] Isotropic fractionator Pallium (cortex) Parascalops breweri [39]
Star-nosed mole 17,000,000 ± 3,105,000[39] Isotropic fractionator Pallium (cortex) Condylura cristata [39]
Golden hamster 17,000,000 ± 3,619,934[39] Isotropic fractionator Pallium (cortex) Mesocricetus auratus [39]
Damaraland mole-rat 21,000,000 Isotropic fractionator Pallium (cortex) Fukomys damarensis [42]
Hottentot golden mole 22,000,000 ± 2,154,000[39] Isotropic fractionator Pallium (cortex) Amblysomus hottentotus [39]
Gray mouse lemur 22,310,000 Isotropic fractionator Pallium (cortex) Microcebus murinus [45]
Mechow's mole-rat 23,000,000 Isotropic fractionator Pallium (cortex) Fukomys mechowii [42]
Franquet's epauletted fruit bat 23,000,000 Isotropic fractionator Pallium (cortex) Epomops franqueti [37]
Hammer-headed bat 24,000,000 Isotropic fractionator Pallium (cortex) Hypsignathus mostrosus [37]
Hedgehog 24,000,000^ Estimated Pallium (cortex) Subfamily Erinaceinae, various species [61]
Silvery mole-rat 25,000,000 Isotropic fractionator Pallium (cortex) Heliophobius argenteocinereus [42]
Wahlberg's epauletted fruit bat 26,000,000 Isotropic fractionator Pallium (cortex) Epomophorus wahlbergi [37]
Cape mole-rat 26,000,000 Isotropic fractionator Pallium (cortex) Georychus capensis [42]
Guyenne spiny rat 26,000,000 ± 2,155,723[39] Isotropic fractionator Pallium (cortex) Proechimys cayennensis [39]
Eastern rock elephant shrew 26,000,000 ± 4,020,000[39] Isotropic fractionator Pallium (cortex) Elephantulus myurus [39]
Eastern mole 27,000,000 ± 5,113,000[39] Isotropic fractionator Pallium (cortex) Scalopus aquaticus [39]
Opossum 27,000,000^ Estimated Pallium (cortex) Didelphis virginiana [61]
Egyptian fruit bat 29,000,000 Isotropic fractionator Pallium (cortex) Rousettus aegyptiacus [37]
Brown Rat 31,000,000 + 3,034,654[39] Isotropic fractionator Pallium (cortex) Rattus norvegicus [39]
Four-toed elephant shrew 34,000,000 ± 5,840,000[39] Isotropic fractionator Pallium (cortex) Petrodromus tetradactylus [39]
Ferret 38,950,000 Isotropic fractionator Pallium (cortex) Mustela putorius furo [47]
Cape dune mole-rat 43,000,000 Isotropic fractionator Pallium (cortex) Bathyergus suillus [42]
Guinea pig 43,510,000 ± 3,169,924[39] Isotropic fractionator Pallium (cortex) Cavia porcellus [36]
Eurasian blackcap 52,000,000 Isotropic fractionator Pallium (DVR) Sylvia atricapilla [43]
Prairie dog 53,770,000 ± 6,044,322[39] Isotropic fractionator Pallium (cortex) Genus:Cynomys [36]
Zebra finch 55,000,000 Isotropic fractionator Pallium (DVR) Taeniopygia guttata [43]
Common treeshrew 60,000,000 ± 26,510,000[39] Isotropic fractionator Pallium (cortex) Tupaia glis [39]
Red junglefowl 61,000,000 Isotropic fractionator Pallium (DVR) Gallus gallus [43]
Goldcrest 64,000,000 Isotropic fractionator Pallium (DVR) Regulus regulus [43]
European rabbit 71,450,000 Isotropic fractionator Pallium (cortex) Oryctolagus cuniculus [36]
Rock dove 72,000,000 Isotropic fractionator Pallium (DVR) Columba livia [43]
Eastern gray squirrel 77,330,000 ± 2,634,444[39] Isotropic fractionator Pallium (cortex) Sciurius carolinensis [36]
Great tit 83,000,000 Isotropic fractionator Pallium (DVR) Parus major [43]
Western tree hyrax 99,000,000 Isotropic fractionator Pallium (cortex) Dendrohyrax dorsalis [39]
Green-rumped parrotlet 103,000,000 Isotropic fractionator Pallium (DVR) Forpus passerinus [43]
Black-rumped agouti 113,000,000 ± 2,576,768[39] Isotropic fractionator Pallium (cortex) Dasyprocta prymnolopha [1]
Banded mongoose 115,770,000 Isotropic fractionator Pallium (cortex) Mungos mungo [47]
Common blackbird 136,000,000 Isotropic fractionator Pallium (DVR) Turdus merula [43]
Budgerigar 149,000,000 Isotropic fractionator Pallium (DVR) Melopsittacus undulatus [43]
Rock hyrax 198,000,000 ± 29,082,000[39] Isotropic fractionator Pallium (cortex) Procavia capensis [39]
Northern greater galago 226,000,000 ± 87,570,000[39] Isotropic fractionator Pallium (cortex) Otolemur garnettii [39]
Common starling 226,000,000 Isotropic fractionator Pallium (DVR) Sturnus vulgaris [43]
Raccoon dog 240,180,000 Isotropic fractionator Pallium (cortex) Nyctereutes procyonoides [50]
Common marmoset 245,000,000 ± 81,180,000[39] Isotropic fractionator Pallium (cortex) Callithrix jacchus [39]
House cat 249,830,000 Isotropic fractionator Pallium (cortex) Felis catus [47]
Brown bear 250,970,000 Isotropic fractionator Pallium (cortex) Ursus arctos [47]
Cockatiel 258,000,000 Isotropic fractionator Pallium (DVR) Nymphicus hollandicus [43]
Capybara 306,500,000 ± 62,726,120[39] Isotropic fractionator Pallium (cortex) Hydrochoerus hydrochaeris [36]
Tarsius 310,000,000 Estimated Pallium (cortex) Genus: Tarsius, unknown species [62]
Eastern rosella 333,000,000 Isotropic fractionator Pallium (DVR) Platycercus eximius [43]
Red fox 355,010,000 Isotropic fractionator Pallium (cortex) Vulpes vulpes [50]
Goeldi's marmoset 357,130,000 Isotropic fractionator Pallium (cortex) Callimico goeldii [45]
Western grey kangaroo 370,170,000 Isotropic fractionator Pallium (cortex) Macropus fuliginosus [63]
Golden jackal 393,620,000 Isotropic fractionator Pallium (cortex) Canis aureus [50]
Monk parakeet 396,000,000 Isotropic fractionator Pallium (DVR) Myiopsitta monachus [43]
Springbok 396,900,000 Isotropic fractionator Pallium (cortex) Antidorcas marsupialis [51]
Azure-winged magpie 400,000,000 Isotropic fractionator Pallium (DVR) Cyanopica cyanus [43]
Common hill myna 410,000,000 Isotropic fractionator Pallium (DVR) Gracula religiosa [43]
Domesticated pig 425,000,000* Optical fractionator Pallium (cortex) Sus scrofa domesticus [64]
Barn owl 437,000,000 Isotropic fractionator Pallium (DVR) Tyto alba [43]
Emu 439,000,000 Isotropic fractionator Pallium (DVR) Dromaius novaehollandiae [43]
West Highland White Terrier 440,160,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
Three-striped night monkey 442,000,000 ± 111,310,000[39] Isotropic fractionator Pallium (cortex) Aotus trivirgatus [1]
Eurasian magpie 443,000,000 Isotropic fractionator Pallium (DVR) Pica pica [43]
Raccoon 453,000,000 Isotropic fractionator Pallium (cortex) Procyon lotor [59]
Chow Chow 471,500,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
Western jackdaw 492,000,000 Isotropic fractionator Pallium (DVR) Coloeus monedula [43]
Striped hyena 495,280,000 Isotropic fractionator Pallium (cortex) Hyaena hyaena [47]
Chihuahua 513,330,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
Eurasian jay 529,000,000 Isotropic fractionator Pallium (DVR) Garrulus glandarius [43]
Lion 545,240,000 Isotropic fractionator Pallium (cortex) Panthera leo [47]
Blesbok 570,670,000 Isotropic fractionator Pallium (cortex) Damaliscus pygargus phillipsi [51]
Yorkshire Terrier 572,140,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
Alexandrine parakeet 575,000,000 Isotropic fractionator Pallium (DVR) Psittacula eupatria [43]
Tanimbar corella 599,000,000 Isotropic fractionator Pallium (DVR) Cacatua goffiniana [43]
Golden retriever 627,000,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [47]
Gracile capuchin monkey 650,000,000^ Estimated Pallium (cortex) Genus: Cebus [65]
Transylvanian Hound 725,760,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
Greater kudu 762,570,000 Isotropic fractionator Pallium (cortex) Tragelaphus strepsiceros [51]
Crab-eating macaque 800,960,000 Isotropic fractionator Pallium (cortex) Macaca fascicularis [45]
Rook 820,000,000 Isotropic fractionator Pallium (DVR) Corvus frugilegus [43]
Beagle 844,410,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
Grey parrot 850,000,000 Isotropic fractionator Pallium (DVR) Psittacus erithacus [43]
Komondor 883,380,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
German Shepherd 885,460,000 Isotropic fractionator Pallium (cortex) Canis lupus familiaris [50]
Sulphur-crested cockatoo 1,135,000,000 Isotropic fractionator Pallium (DVR) Cacatua galerita [43]
Tufted capuchin 1,140,000,000 Isotropic fractionator Pallium (cortex) Sapajus apella [39][1]
Harp seal 1,168,000,000^

6,100,000,000*

Estimated

Optical fractionator

Pallium (cortex) Pagophilus groenlandicus [66][67]
Horse 1,200,000,000* Optical fractionator Pallium (cortex) Equus ferus caballus [68]
Raven 1,204,000,000 Isotropic fractionator Pallium (DVR) Corvus corax [43]
Kea 1,281,000,000 Isotropic fractionator Pallium (DVR) Nestor notabilis [43]
Common squirrel monkey 1,340,000,000 ± 20,000,000[39] Isotropic fractionator Pallium (cortex) Saimiri sciureus [39]
Bonnet macaque 1,660,000,000 Isotropic fractionator Pallium (cortex) Macaca radiata [39]
Rhesus macaque 1,710,000,000 Isotropic fractionator Pallium (cortex) Macaca mulatta [39]
Giraffe 1,731,000,000 Isotropic fractionator Pallium (cortex) Giraffa camelopardalis [51]
Blue and yellow macaw 1,900,000,000 Isotropic fractionator Pallium (DVR) Ara ararauna [43]
Pygmy sperm whale 2,020,000,000* Optical fractionator Pallium (cortex) Kogia breviceps [69]
Leopard seal 2,386,000,000^ Estimated Pallium (cortex) Hydrurga leptonyx [66]
Guenon 2,500,000,000^ Estimated Pallium (cortex) Genus: Cercopithecus, unknown species [62]
Pigtail Macaque 2,531,000,000^ Estimated Pallium (cortex) Macaca nemestrina [66]
Gelada baboon 2,568,000,000^ Estimated Pallium (cortex) Theropithecus gelada [66]
Red-and-green macaw 2,646,000,000^ Estimated Pallium (DVR) Ara chloropterus [66]
Harbor porpoise 2,750,000,000* Optical fractionator Pallium (cortex) Phocoena phocoena [66][67]
Yellow baboon 2,880,000,000 Isotropic fractionator Pallium (cortex) Papio cynocephalus [45]
Hyacinth macaw 2,944,000,000^ Estimated Pallium (DVR) Anodorhynchus hyacinthinus [66]
Hamadryas baboon 2,990,000,000^ Estimated Pallium (cortex) Papio hamadryas [66]
Mandrill 3,102,000,000^ Estimated Pallium (cortex) Mandrillus sphinx [66]
Walrus 3,929,000,000^ Estimated Pallium (cortex) Odobenus rosmarus [66]
Southern elephant seal 3,994,000,000^ Estimated Pallium (cortex) Mirounga leonina [66]
African elephant 5,600,000,000 Isotropic fractionator Pallium (cortex) Loxodonta africana [57]
Short-beaked common dolphin 6,700,000,000* Optical fractionator Pallium (cortex) Delphinus delphis [66][69]
Asian elephant 6,775,000,000^ Estimated Pallium (cortex) Elephas maximus [66]
Pygmy chimpanzee or bonobo 7,250,000,000^ Estimated Pallium (cortex) Pan paniscus [66]
Chimpanzee 7,400,000,000* Optical fractionator Pallium (cortex) Pan troglodytes [70]
Orangutan 7,704,000,000^ - 8,900,000,000^ Estimated Pallium (cortex) Genus: Pongo [66][53]
Western gorilla 9,100,000,000^ Estimated Pallium (cortex) Gorilla gorilla [66][53]
Cuvier's beaked whale 9,100,000,000* Optical fractionator Pallium (cortex) Ziphius cavirostris [69]
Beluga whale 10,000,000,000^ Estimated Pallium (cortex) Delphinapterus leucas [66]
Bottlenose dolphin 12,700,000,000* Optical fractionator Pallium (cortex) Tursiops truncatus [66][69]
Common minke whale 12,800,000,000* Optical fractionator Pallium (cortex) Balaenoptera acutorostrata [71]
Fin whale 15,000,000,000* Optical fractionator Pallium (cortex) Balaenoptera physalus [66][72]
Blue whale 15,000,000,000^ Estimated Pallium (cortex) Balaenoptera musculus [66]
Human 16,340,000,000

21,000,000,000*

± 2,170,000,000[39] Isotropic fractionator

Optical fractionator

Pallium (cortex) Homo sapiens [39][54][1][73][74]
Risso's dolphin 18,750,000,000^ Estimated Pallium (cortex) Grampus griseus [66]
Short-finned pilot whale 35,000,000,000^ Estimated Pallium (cortex) Globicephala macrorhynchus [66]
Long-finned pilot whale 37,200,000,000* Optical fractionator Pallium (cortex) Globicephala melas [75]
Killer whale 43,100,000,000* Optical fractionator Pallium (cortex) Orcinus orca [66][69]

See alsoEdit

NotesEdit

  1. ^ ^ = Estimated
    * = Optical fractionator
  2. ^ ± standard deviation
  3. ^ For the estimated values, the numbers of cortical neurons estimated from brain mass for different mammalian and bird orders are based on correlation observed between number of cortical neuron and brain mass per order[39]

ReferencesEdit

  1. ^ a b c d e f g h Herculano-Houzel S (9 November 2009). "The human brain in numbers: a linearly scaled-up primate brain". Frontiers in Human Neuroscience. 3: 31. doi:10.3389/neuro.09.031.2009. PMC 2776484. PMID 19915731.
  2. ^ Randerson J (28 February 2012). "How many neurons make a human brain? Billions fewer than we thought". The Guardian.
  3. ^ Sherwood L, Klandorf H and Yancey P (2012) Animal Physiology: From Genes to Organisms Cengage Learning, p. 150. ISBN 9781133709510.
  4. ^ Smith CL, Pivovarova N, Reese TS (2015). "Coordinated Feeding Behavior in Trichoplax, an Animal without Synapses". PLOS ONE. 10 (9): e0136098. Bibcode:2015PLoSO..1036098S. doi:10.1371/journal.pone.0136098. PMC 4558020. PMID 26333190. Lay summaryYouTube.
  5. ^ Schierwater B (December 2005). "My favorite animal, Trichoplax adhaerens". BioEssays. 27 (12): 1294–302. doi:10.1002/bies.20320. PMID 16299758.
  6. ^ Ware RW (1975). Three-dimensional reconstruction from serial sections. International Review of Cytology. 40. pp. 325–440. doi:10.1016/S0074-7696(08)60956-0. ISBN 9780123643407. PMID 1097356.
  7. ^ Martin C, Gross V, Hering L, Tepper B, Jahn H, de Sena Oliveira I, et al. (August 2017). "The nervous and visual systems of onychophorans and tardigrades: learning about arthropod evolution from their closest relatives" (PDF). Journal of Comparative Physiology A: Neuroethology, Sensory, Neural & Behavioral Physiology. 203 (8): 565–590. doi:10.1007/s00359-017-1186-4. PMID 28600600. S2CID 25280904.
  8. ^ Ryan K, Lu Z, Meinertzhagen IA (December 2016). "The CNS connectome of a tadpole larva of Ciona intestinalis (L.) highlights sidedness in the brain of a chordate sibling". eLife. 5: e16962. doi:10.7554/eLife.16962. PMC 5140270. PMID 27921996.
  9. ^ Ryan K, Lu Z, Meinertzhagen IA (March 2018). "The peripheral nervous system of the ascidian tadpole larva: Types of neurons and their synaptic networks". The Journal of Comparative Neurology. 526 (4): 583–608. doi:10.1002/cne.24353. PMID 29124768. S2CID 20052591.
  10. ^ White JG, Southgate E, Thomson JN, Brenner S (November 1986). "The structure of the nervous system of the nematode Caenorhabditis elegans". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 314 (1165): 1–340. Bibcode:1986RSPTB.314....1W. doi:10.1098/rstb.1986.0056. PMID 22462104.
  11. ^ White JG (June 2013). "Getting into the mind of a worm--a personal view". WormBook: 1–10. doi:10.1895/wormbook.1.158.1. PMC 4781474. PMID 23801597.
  12. ^ Jabr F (2012-10-02). "The Connectome Debate: Is Mapping the Mind of a Worm Worth It?". Scientific American. Retrieved 2014-01-18.
  13. ^ White JG, Southgate E, Thomson JN, Brenner S (November 1986). "The structure of the nervous system of the nematode Caenorhabditis elegans". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 314 (1165): 1–340. Bibcode:1986RSPTB.314....1W. doi:10.1098/rstb.1986.0056. PMID 22462104. S2CID 5006466.
  14. ^ Bode H, Berking S, David CN, Gierer A, Schaller H, Trenkner E (December 1973). "Quantitative analysis of cell types during growth and morphogenesis in Hydra". Wilhelm Roux' Archiv für Entwicklungsmechanik der Organismen (Submitted manuscript). 171 (4): 269–285. doi:10.1007/BF00577725. PMID 28304608. S2CID 5484431.
  15. ^ Polilov AA (January 2012). "The smallest insects evolve anucleate neurons". Arthropod Structure & Development. 41 (1): 29–34. doi:10.1016/j.asd.2011.09.001. PMID 22078364.
  16. ^ Garm A, Poussart Y, Parkefelt L, Ekström P, Nilsson DE (July 2007). "The ring nerve of the box jellyfish Tripedalia cystophora". Cell and Tissue Research. 329 (1): 147–57. doi:10.1007/s00441-007-0393-7. PMID 17340150. S2CID 26982210.
  17. ^ Kuffler SW, Potter DD (March 1964). "Glia in the Leech Central Nervous System: Physiological Properties and Neuron-Glia Relationship". Journal of Neurophysiology. 27 (2): 290–320. doi:10.1152/jn.1964.27.2.290. PMID 14129773.
  18. ^ Roth G, Dicke U (May 2005). "Evolution of the brain and intelligence". Trends in Cognitive Sciences. 9 (5): 250–7. doi:10.1016/j.tics.2005.03.005. PMID 15866152. S2CID 14758763. as PDF Archived 2009-07-31 at the Wayback Machine
  19. ^ Cash D, Carew TJ (January 1989). "A quantitative analysis of the development of the central nervous system in juvenile Aplysia californica". Journal of Neurobiology. 20 (1): 25–47. doi:10.1002/neu.480200104. PMID 2921607.
  20. ^ Roth G (3 June 2013). The Long Evolution of Brains and Minds. Springer Science & Business Media. p. 121. ISBN 978-94-007-6259-6. Retrieved 9 December 2015.
  21. ^ Aniszewski T (25 April 2015). Alkaloids: Chemistry, Biology, Ecology, and Applications. Elsevier Science. p. 316. ISBN 978-0-444-59462-4. Retrieved 9 December 2015.
  22. ^ Scientists Capture All The Neurons Firing Across A Fish's Brain On Video Popular Science, 19 March 2013.
  23. ^ "Anatomy & Biology". The Lobster Institute. University of Maine. Archived from the original on February 8, 2018. Retrieved March 19, 2016.
  24. ^ Servick K (July 19, 2018). "In a 'tour de force', researchers image an entire fly brain in minute detail". Science. Retrieved May 18, 2021.
  25. ^ Babu KS, Barth FG (1984). "Neuroanatomy of the central nervous system of the wandering spider, Cupiennius salei (Arachnida, Araneida)". Zoomorphology. 104: 344–359.
  26. ^ a b c d e f g Godfrey RK, Swartzlander M, Gronenberg W (March 2021). "Allometric analysis of brain cell number in Hymenoptera suggests ant brains diverge from general trends". Proceedings. Biological Sciences. 288 (1947): 20210199. doi:10.1098/rspb.2021.0199. PMC 8059961. PMID 33757353.
  27. ^ John and Sarah Tefl. "Interesting Facts About Ants". Retrieved December 23, 2010.
  28. ^ Menzel R, Giurfa M (February 2001). "Cognitive architecture of a mini-brain: the honeybee". Trends in Cognitive Sciences. 5 (2): 62–71. doi:10.1016/S1364-6613(00)01601-6. PMID 11166636. S2CID 3202685.
  29. ^ "A Strange Approach to Social Interaction, and Butterflies". Anthropology.net. January 10, 2007. Archived from the original on January 13, 2007. Retrieved November 26, 2010.
  30. ^ Krieger J, Sandeman RE, Sandeman DC, Hansson BS, Harzsch S (September 2010). "Brain architecture of the largest living land arthropod, the Giant Robber Crab Birgus latro (Crustacea, Anomura, Coenobitidae): evidence for a prominent central olfactory pathway?". Frontiers in Zoology. 7 (1): 25. doi:10.1186/1742-9994-7-25. PMC 2945339. PMID 20831795.
  31. ^ a b Storks L, Powell BJ, Leal M (September 2020). "Peeking Inside the Lizard Brain: Neuron Numbers in Anolis and Its Implications for Cognitive Performance and Vertebrate Brain Evolution". Integrative and Comparative Biology. doi:10.1093/icb/icaa129. PMID 33175153.
  32. ^ Marhounová L, Kotrschal A, Kverková K, Kolm N, Němec P (September 2019). "Artificial selection on brain size leads to matching changes in overall number of neurons". Evolution; International Journal of Organic Evolution. 73 (9): 2003–2012. doi:10.1111/evo.13805. PMC 6772110. PMID 31339177.
  33. ^ Kverková K, Polonyiová A, Kubička L, Němec P (September 2020). "Individual and age-related variation of cellular brain composition in a squamate reptile". Biology Letters. 16 (9): 20200280. doi:10.1098/rsbl.2020.0280. PMC 7532707. PMID 32961085.
  34. ^ Hinsch K, Zupanc GK (May 2007). "Generation and long-term persistence of new neurons in the adult zebrafish brain: a quantitative analysis". Neuroscience. 146 (2): 679–96. doi:10.1016/j.neuroscience.2007.01.071. PMID 17395385. S2CID 5643696.
  35. ^ "Frog Brain Neuron Number". Archived from the original on 16 July 2015. Retrieved 15 July 2015.
  36. ^ a b c d e f g h i j k Herculano-Houzel S, Ribeiro P, Campos L, Valotta da Silva A, Torres LB, Catania KC, Kaas JH (2011). "Updated neuronal scaling rules for the brains of Glires (rodents/lagomorphs)". Brain, Behavior and Evolution. 78 (4): 302–14. doi:10.1159/000330825. PMC 3237106. PMID 21985803.
  37. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z Herculano-Houzel S, da Cunha FB, Reed JL, Kaswera-Kyamakya C, Gillissen E, Manger PR (December 2020). "Microchiropterans have a diminutive cerebral cortex, not an enlarged cerebellum, compared to megachiropterans and other mammals". The Journal of Comparative Neurology. 528 (17): 2978–2993. doi:10.1002/cne.24985. PMID 32656795. S2CID 220499352.
  38. ^ a b c d Hofman MA, Falk D (2 March 2012). Evolution of the Primate Brain: From Neuron to Behavior. Elsevier. p. 425. ISBN 978-0-444-53860-4.
  39. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc Herculano-Houzel S, Catania K, Manger PR, Kaas JH (2015). "Mammalian Brains Are Made of These: A Dataset of the Numbers and Densities of Neuronal and Nonneuronal Cells in the Brain of Glires, Primates, Scandentia, Eulipotyphlans, Afrotherians and Artiodactyls, and Their Relationship with Body Mass". Brain, Behavior and Evolution. S. Karger AG. 86 (3–4): 145–63. doi:10.1159/000437413. PMID 26418466. S2CID 10637829.[permanent dead link]
  40. ^ a b c d e f Herculano-Houzel S, Mota B, Lent R (August 2006). "Cellular scaling rules for rodent brains". Proceedings of the National Academy of Sciences of the United States of America. 103 (32): 12138–43. Bibcode:2006PNAS..10312138H. doi:10.1073/pnas.0604911103. PMC 1567708. PMID 16880386.
  41. ^ a b Ngwenya A, Patzke N, Manger PR, Herculano-Houzel S (2016). "Continued Growth of the Central Nervous System without Mandatory Addition of Neurons in the Nile Crocodile (Crocodylus niloticus)". Brain, Behavior and Evolution. 87 (1): 19–38. doi:10.1159/000443201. PMID 26914769. S2CID 5353731.
  42. ^ a b c d e f g h i j k l m n Kverková K, Bělíková T, Olkowicz S, Pavelková Z, O'Riain MJ, Šumbera R, et al. (June 2018). "Sociality does not drive the evolution of large brains in eusocial African mole-rats". Scientific Reports. 8 (1): 9203. Bibcode:2018NatSR...8.9203K. doi:10.1038/s41598-018-26062-8. PMC 6003933. PMID 29907782.
  43. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be Olkowicz S, Kocourek M, Lučan RK, Porteš M, Fitch WT, Herculano-Houzel S, Němec P (June 2016). "Birds have primate-like numbers of neurons in the forebrain". Proceedings of the National Academy of Sciences of the United States of America. 113 (26): 7255–60. doi:10.1073/pnas.1517131113. PMC 4932926. PMID 27298365.
  44. ^ a b Herculano-Houzel S, Lent R (March 2005). "Isotropic fractionator: a simple, rapid method for the quantification of total cell and neuron numbers in the brain". The Journal of Neuroscience. 25 (10): 2518–21. doi:10.1523/jneurosci.4526-04.2005. PMC 6725175. PMID 15758160.
  45. ^ a b c d e f g h i Gabi M, Collins CE, Wong P, Torres LB, Kaas JH, Herculano-Houzel S (2010). "Cellular scaling rules for the brains of an extended number of primate species". Brain, Behavior and Evolution. 76 (1): 32–44. doi:10.1159/000319872. PMC 2980814. PMID 20926854.
  46. ^ a b c d e f g h Herculano-Houzel S, Collins CE, Wong P, Kaas JH (February 2007). "Cellular scaling rules for primate brains". Proceedings of the National Academy of Sciences of the United States of America. 104 (9): 3562–7. Bibcode:2007PNAS..104.3562H. doi:10.1073/pnas.0611396104. PMC 1805542. PMID 17360682.
  47. ^ a b c d e f g h i j k l m n Jardim-Messeder D, Lambert K, Noctor S, Pestana FM, de Castro Leal ME, Bertelsen MF, et al. (2017). "Dogs Have the Most Neurons, Though Not the Largest Brain: Trade-Off between Body Mass and Number of Neurons in the Cerebral Cortex of Large Carnivoran Species". Frontiers in Neuroanatomy. 11: 118. doi:10.3389/fnana.2017.00118. PMC 5733047. PMID 29311850.
  48. ^ "Brain Facts and Figures". Retrieved 15 July 2015.
  49. ^ Ananthanarayanan R, Esser SK, Simon HD, Modha DS (2009). "The cat is out of the bag: cortical simulations with 109 neurons, 1013 synapses". Proceedings of the Conference on High Performance Computing Networking, Storage and Analysis - SC '09. pp. 1–12. doi:10.1145/1654059.1654124. ISBN 978-1-60558-744-8. S2CID 6110450.
  50. ^ a b c d e f g h i j k l m n o p q r s t u Salajková V (2020-02-03). "Pravidla buněčného škálování mozku u psů: Efekt domestikace a miniaturizace psích plemen" (in Czech). Cite journal requires |journal= (help)
  51. ^ a b c d e f g h i j Kazu RS, Maldonado J, Mota B, Manger PR, Herculano-Houzel S (2015). "Corrigendum: Cellular scaling rules for the brain of Artiodactyla include a highly folded cortex with few neurons". Frontiers in Neuroanatomy. 9: 39. doi:10.3389/fnana.2015.00039. PMC 4374476. PMID 25859187.
  52. ^ a b Herculano-Houzel S (June 2012). "The remarkable, yet not extraordinary, human brain as a scaled-up primate brain and its associated cost". Proceedings of the National Academy of Sciences of the United States of America. 109 Suppl 1: 10661–8. doi:10.1073/pnas.1201895109. PMC 3386878. PMID 22723358.
  53. ^ a b c d e Herculano-Houzel S, Kaas JH (2011). "Gorilla and orangutan brains conform to the primate cellular scaling rules: implications for human evolution". Brain, Behavior and Evolution. 77 (1): 33–44. doi:10.1159/000322729. PMC 3064932. PMID 21228547.
  54. ^ a b c Azevedo FA, Carvalho LR, Grinberg LT, Farfel JM, Ferretti RE, Leite RE, et al. (April 2009). "Equal numbers of neuronal and nonneuronal cells make the human brain an isometrically scaled-up primate brain". The Journal of Comparative Neurology. 513 (5): 532–41. doi:10.1002/cne.21974. PMID 19226510. S2CID 5200449.
  55. ^ a b Herculano-Houzel S (June 2012). "The remarkable, yet not extraordinary, human brain as a scaled-up primate brain and its associated cost". Proceedings of the National Academy of Sciences of the United States of America. 109 Suppl 1 (Supplement_1): 10661–8. doi:10.1073/pnas.1201895109. PMC 3386878. PMID 22723358.
  56. ^ Tower DB (August 1954). "Structural and functional organization of mammalian cerebral cortex; the correlation of neurone density with brain size; cortical neurone density in the fin whale (Balaenoptera physalus L.) with a note on the cortical neurone density in the Indian elephant". The Journal of Comparative Neurology. 101 (1): 19–51. doi:10.1002/cne.901010103. PMID 13211853. S2CID 10396499.
  57. ^ a b c Herculano-Houzel S, Avelino-de-Souza K, Neves K, Porfírio J, Messeder D, Mattos Feijó L, et al. (2014). "The elephant brain in numbers". Frontiers in Neuroanatomy. 8: 46. doi:10.3389/fnana.2014.00046. PMC 4053853. PMID 24971054.
  58. ^ "Searching For The Elephant's Genius Inside the Largest Brain on Land". Scientificamerica. 26 February 2014.
  59. ^ a b Lambert KG, Bardi M, Landis T, Hyer MM, Rzucidlo A, Gehrt S, Anchor C, Jardim Messeder D, Herculano-Houzel S (2014). "Behind the Mask: Neurobiological indicants of emotional resilience and cognitive function in wild raccoons (Procyon lotor)". Society for Neuroscienc.
  60. ^ a b c d Heisenberg M (May 1998). "What do the mushroom bodies do for the insect brain? an introduction". Learning & Memory. 5 (1–2): 1–10. PMC 311238. PMID 10454369.
  61. ^ a b Fasolo A (30 November 2011). The Theory of Evolution and Its Impact. Springer. p. 182. ISBN 978-88-470-1973-7.
  62. ^ a b Quarton GC, Melnechuk T, Schmitt FO (1967). The neurosciences. Rockefeller University Press. p. 732. GGKEY:DF21HXQKLNX.
  63. ^ Dos Santos SE, Porfirio J, da Cunha FB, Manger PR, Tavares W, Pessoa L, et al. (2017). "Cellular Scaling Rules for the Brains of Marsupials: Not as "Primitive" as Expected". Brain, Behavior and Evolution. 89 (1): 48–63. doi:10.1159/000452856. PMID 28125804. Table S1: Cellular composition of the Marsupial brains.
  64. ^ Phillips, Kathryn (2006). "Learning from Pig Brains". Journal of Experimental Biology. 209 (8): ii. doi:10.1242/jeb.02215. S2CID 144033784. Retrieved 15 July 2015.
  65. ^ Hofman MA, Falk D (2 March 2012). Evolution of the Primate Brain: From Neuron to Behavior. Elsevier. p. 424. ISBN 978-0-444-53867-3.
  66. ^ a b c d e f g h i j k l m n o p q r s t u v w Herculano-Houzel S (July 2019). "Longevity and sexual maturity vary across species with number of cortical neurons, and humans are no exception". The Journal of Comparative Neurology. 527 (10): 1689–1705. doi:10.1002/cne.24564. PMID 30350858. S2CID 53033539.
  67. ^ a b Walløe S, Eriksen N, Dabelsteen T, Pakkenberg B (December 2010). "A neurological comparative study of the harp seal (Pagophilus groenlandicus) and harbor porpoise (Phocoena phocoena) brain". Anatomical Record. 293 (12): 2129–35. doi:10.1002/ar.21295. PMID 21077171. S2CID 2636107.
  68. ^ Haug H (October 1987). "Brain sizes, surfaces, and neuronal sizes of the cortex cerebri: a stereological investigation of man and his variability and a comparison with some mammals (primates, whales, marsupials, insectivores, and one elephant)". The American Journal of Anatomy. 180 (2): 126–42. doi:10.1002/aja.1001800203. PMID 3673918.
  69. ^ a b c d e Ridgway SH, Brownson RH, Van Alstyne KR, Hauser RA (2019-12-16). "Higher neuron densities in the cerebral cortex and larger cerebellums may limit dive times of delphinids compared to deep-diving toothed whales". PLOS ONE. 14 (12): e0226206. Bibcode:2019PLoSO..1426206R. doi:10.1371/journal.pone.0226206. PMC 6914331. PMID 31841529.
  70. ^ Collins CE, Turner EC, Sawyer EK, Reed JL, Young NA, Flaherty DK, Kaas JH (January 2016). "Cortical cell and neuron density estimates in one chimpanzee hemisphere". Proceedings of the National Academy of Sciences of the United States of America. 113 (3): 740–5. Bibcode:2016PNAS..113..740C. doi:10.1073/pnas.1524208113. PMC 4725503. PMID 26729880.
  71. ^ Eriksen N, Pakkenberg B (January 2007). "Total neocortical cell number in the mysticete brain". Anatomical Record. 290 (1): 83–95. doi:10.1002/ar.20404. PMID 17441201. S2CID 31374672.
  72. ^ Food and Agriculture Organization of the United Nations Working Party on Marine Mammals (1978-01-01). Mammals in the Seas: Report. Food & Agriculture Org. ISBN 9789251005132.
  73. ^ Steven M. Platek; Julian Paul Keenan & Todd K. Shackelford (2009). "Evolutionary Cognitive Neuroscience" (PDF): 139. Cite journal requires |journal= (help)
  74. ^ Pakkenberg B, Gundersen HJ (July 1997). "Neocortical neuron number in humans: effect of sex and age". The Journal of Comparative Neurology. Wiley‐Liss, Inc. 384 (2): 312–20. doi:10.1002/(SICI)1096-9861(19970728)384:2<312::AID-CNE10>3.0.CO;2-K. PMID 9215725.
  75. ^ Mortensen HS, Pakkenberg B, Dam M, Dietz R, Sonne C, Mikkelsen B, Eriksen N (2014). "Quantitative relationships in delphinid neocortex". Frontiers in Neuroanatomy. 8: 132. doi:10.3389/fnana.2014.00132. PMC 4244864. PMID 25505387.