Cranial nerve nucleus
A cranial nerve nucleus is a collection of neurons (gray matter) in the brain stem that is associated with one or more cranial nerves. Axons carrying information to and from the cranial nerves form a synapse first at these nuclei. Lesions occurring at these nuclei can lead to effects resembling those seen by the severing of nerve(s) they are associated with. All the nuclei except that of the trochlear nerve (CN IV) supply nerves of the same side of the body.
|Cranial nerve nucleus|
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (The olfactory and optic centers are not represented.)
|Latin||nucleus nervi cranialis|
|Anatomical terms of neuroanatomy|
Motor and sensoryEdit
- Close to the midline are the motor efferent nuclei, such as the oculomotor nucleus, which control skeletal muscle. Just lateral to this are the autonomic (or visceral) efferent nuclei.
- There is a separation, called the sulcus limitans, and lateral to this are the sensory nuclei. Near the sulcus limitans are the visceral afferent nuclei, namely the solitary tract nucleus.
- More lateral, but also less posterior, are the general somatic afferent nuclei. This is the trigeminal nucleus. Back at the dorsal surface of the brainstem, and more lateral are the special somatic afferents, this handles sensation such as balance.
- Another area, not on the dorsum of the brainstem, is where the special visceral efferents nuclei reside. These formed from the pharyngeal arches, in the embryo. This area is a bit below the autonomic motor nuclei, and includes the nucleus ambiguus, facial nerve nucleus, as well as the motor part of the trigeminal nerve nucleus.
This list documents nuclei by the part of the brain they are found in:
|Olfactory nerve||Olfactory bulb|
|Optic nerve||Lateral geniculate nucleus|
|Oculomotor nerve||Oculomotor nucleus|
[[Accessory nucleus or Edinger-Westphal nucleus]]
|Trochlear nerve||Trochlear nucleus|
|Trigeminal nerve||Trigeminal nerve nuclei:|
Principal sensory nucleus
Spinal trigeminal nucleus
Trigeminal motor nucleus
|Abducens nerve||Abducens nucleus|
|Facial nerve||Facial motor nucleus|
Superior salivatory nucleus
|Vestibulocochlear nerve||Vestibular nuclei|
|Glossopharyngeal nerve||Solitary nucleus|
Spinal nucleus of the trigeminal nerve
Lateral nucleus of vagal trigone.
Inferior salivatory nucleus
|Vagus nerve||Dorsal nucleus of vagus nerve|
Spinal trigeminal nucleus
|Accessory nerve||Spinal accessory nucleus|
|Hypoglossal nerve||Hypoglossal nucleus|