Medical Definition of Tractus spinothalamicus

1. A large ascending fibre bundle in the ventral half of the lateral funiculus of the spinal cord, arising from cells in the posterior horn at all levels of the cord, which cross within their segments of origin in the white commissure. In their contralateral ascent, the bundle is intermingled with numerous intersegmental fibres. The spinothalamic tract continues from the spinal cord into the brainstem, occupying a ventrolateral position and issuing numerous fibres to the rhombencephalic and mesencephalic reticular formation, to the lateral part of the central gray substance of the mesencephalon, and to the deep and intermediate layers of the superior colliculus; the relatively few fibres (10 to 20%) that remain form the true spinothalamic tract which enters the diencephalon and ends in the nucleus ventralis posterior (caudal part) and intralaminar nuclei of the thalamus. In its ascent in the spinal cord the tract is composed of a dorsal part, the lateral spinothalamic tract, which conveys impulses associated with pain and temperature sensation, and a more ventral part, the anterior spinsothalamic tract, involved in tactile sensation. Synonym: lemniscus spinalis, spinal lemniscus, tractus spinothalamicus. (05 Mar 2000)

Lexicographical Neighbors of Tractus Spinothalamicus

tractus occipitopontinus
tractus olfactorius
tractus olivocerebellaris
tractus opticus
tractus parietopontinus
tractus pyramidalis
tractus pyramidalis anterior
tractus pyramidalis lateralis
tractus reticulospinalis
tractus rubrospinalis
tractus solitarius
tractus spinalis nervi trigemini
tractus spinocerebellaris anterior
tractus spinocerebellaris posterior
tractus spinotectalis
tractus spinothalamicus (current term)
tractus spinothalamicus anterior
tractus spinothalamicus lateralis
tractus spiralis foraminosus
tractus supraopticohypophysialis
tractus tectobulbaris
tractus tectopontinus
tractus tectospinalis
tractus temporopontinus
tractus tuberoinfundibularis
tractus vestibulospinalis
tractuses
trad
tradable

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