spinal trigeminal nucleus

(redirected from Spinal nucleus)

spi·nal nu·cle·us of tri·gem·i·nal nerve

[TA]
the long sensory nucleus extending from the caudal border of the pontine sensory nucleus of the trigeminus down through the lateral region of the rhombencephalon into the upper three segments of the spinal cord's dorsal horn; it receives the fibers of the sensory root of the trigeminal nerve that descend along its lateral border as the spinal tract of trigeminal nerve [TA]. Small numbers of fibers to the nucleus originate on cranial nerves VII, IX, and X. This nucleus is divided into a pars caudalis [TA] (caudal part [TA]), a pars interpolaris [TA] (interpolar part [TA]), and a subnucleus oralis [TA] (oral subnucleus [TA]). The pars caudalis is further organized into a subnucleus zonalis [TA] (zonal subnucleus [TA]), a subnucleus gelatinosus [TA] (gelatinosus subnucleus [TA]), and a subnucleus magnocellularis [TA] (magnocellular subnucleus [TA]).

spinal trigeminal nucleus

A nucleus of the general somatic sensory column that extends through the entire hindbrain as a continuation of the dorsal horn nuclei of the spinal cord; rostrally the spinal trigeminal nucleus merges into the principal sensory trigeminal nucleus. The spinal trigeminal nucleus receives axons, from the trigeminal nerve (CN V) and other cranial nerves, carrying pain and temperature signals from the face and mouth. This nucleus sends axons to the ventral posterior nucleus of the thalamus via the medial lemniscus and the spinothalamic tract.
Synonym: trigeminal spinal nucleus
See also: nucleus
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