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The inferior parietal lobule (subparietal district) lies below the horizontal portion of the intraparietal sulcus, and behind the lower part of the postcentral sulcus. Also known as Geschwind’s territory after Norman Geschwind, an American neurologist, who in the early 1960s foresaw its importance.[1]

Inferior parietal lobule
Gray726 inferior parietal lobule.png
Lateral surface of left cerebral hemisphere, viewed from the side. (Inferior parietal lobule is shown in orange.)
Superficial anatomy of the inferior parietal lobule (IPL).png
Superficial anatomy of the inferior parietal lobule.
  Purple: Supramarginal gyrus
  Blue: Angular gyrus
LS: Lateral sulcus (Sylvian fissure), CS: Central sulcus, IPS: Intraparietal sulcus, STS:Superior temporal sulcus, PN: Preoccipital notch.
Part ofParietal lobe
LatinLobulus parietalis inferior
NeuroLex IDbirnlex_1194
Anatomical terms of neuroanatomy


It is divided from rostral to caudal into two gyri:


Inferior parietal lobule has been involved in the perception of emotions in facial stimuli,[2] and interpretation of sensory information. The Inferior parietal lobule is concerned with language, mathematical operations, and body image, particularly the supramarginal gyrus and the angular gyrus.[3]

Clinical significanceEdit

Destruction to the inferior parietal lobule of the dominant hemisphere results in Gerstmann's syndrome: right-to-left confusion, finger agnosia, dysgraphia and dyslexia, dyscalculia, contralateral hemianopia, or lower quadrantanopia. Destruction to the inferior parietal lobule of the non-dominant hemisphere results in topographic memory loss, anosognosia, construction apraxia, dressing apraxia, contralateral sensory neglect, contralateral hemianopia, or lower quadrantanopia.

In other animalsEdit

Functional imaging experiments suggest that the left anterior supramarginal gyrus (aSMG) of the human inferior parietal lobule exhibits an evolved specialization related to tool use. It is not currently known if this functional specialization is unique to humans as complementary experiments have only been performed with macaque monkeys and not apes. The habitual use of tools by chimpanzees makes the uniqueness of the human aSMG an open question as its function may have evolved prior to the split from our last common ancestor.[4]

Additional imagesEdit


This article incorporates text in the public domain from page 823 of the 20th edition of Gray's Anatomy (1918)

  1. ^ "The Brain from top to bottom". 2011.
  2. ^ Radua, Joaquim; Phillips, Mary L.; Russell, Tamara; Lawrence, Natalia; Marshall, Nicolette; Kalidindi, Sridevi; El-Hage, Wissam; McDonald, Colm; et al. (2010). "Neural response to specific components of fearful faces in healthy and schizophrenic adults". NeuroImage. 49 (1): 939–946. doi:10.1016/j.neuroimage.2009.08.030. PMID 19699306.
  3. ^ "Journal of Neurology, Neurosurgery & Psychiatry". 2003.
  4. ^ Peeters et al. 2009


External linksEdit