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Trigeminal nerve nuclei

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Brain: Trigeminal nerve nuclei
Gray696
The cranial nerve nuclei schematically represented; dorsal view. Motor nuclei in red; sensory in blue. (Trigeminal nerve nuclei are at "V".)
[[Image:|250px|center|]]
Latin '
Gray's subject #187 787
Part of
Components
Artery
Vein
BrainInfo/UW ancil-1008020136
MeSH A08.186.211.132.931

The sensory trigeminal nerve nucleus is the largest of the cranial nerve nuclei, and extends through the whole of the brainstem, midbrain to medulla.

The nucleus is divided into three parts, from rostral to caudal (top to bottom in humans), the mesencephalic nucleus, the chief sensory or pontine nucleus, and the spinal nucleus. There is also a distinct motor nucleus that is medial to the chief sensory nucleus.

The spinal trigeminal nucleus is further subdivided into three parts, from rostral to caudal:
  • Pars Oralis
  • Pars Interpolaris
  • Pars Caudalis

There is also a distinct trigeminal motor nucleus that is medial to the chief sensory nucleus. This contains motor neurons that innervate muscles of the first branchial arch, namely the muscles of mastication, the tensor tympani, tensor veli palatini, mylohyoid, and anterior belly of the digastric. (BrainInfo at the University of Washington hier-551)

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Mesencephalon (midbrain)

cerebral peduncle: midbrain tegmentum (periaqueductal gray, ventral tegmentum, nucleus raphe dorsalis), pretectum, substantia nigra, red nucleus, pedunculopontine nucleus, medial longitudinal fasciculus, medial lemniscus, rubrospinal tract, lateral lemniscus

tectum: corpora quadrigemina, inferior colliculi, superior colliculi

cerebral aqueduct: oculomotor nucleus, trochlear nucleus, Edinger-Westphal nucleus

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