Dorsal trigeminal tract

Dorsal trigeminal tract
Details
Identifiers
Latin tractus trigeminothalamicus posterior
NeuroNames 606
NeuroLex ID birnlex_1718
TA A14.1.05.312
FMA 72500
Anatomical terms of neuroanatomy

The posterior trigeminothalamic tract (or dorsal trigeminothalamic tract) is composed of second order neuronal axons. These fibers carry sensory information about discriminative touch and conscious proprioception in the oral cavity from the principal (chief sensory) nucleus to the ventral posteromedial (VPM) nucleus of the thalamus.

The posterior trigeminothalamic tract is also called the posterior trigeminal lemniscus.[1]

Pathway

The first order neurons (from the trigeminal ganglion) enter the medulla and synapse in the principal (chief sensory) nucleus. Axons of the second order neurons then decussates to enter the trigeminal lemniscus in the midbrain and then ascend to the ventral posteromedial nucleus of the contralateral thalamus, forming the posterior trigeminothalamic tract. The third order neurons in the thalamus ascend to the sensory cortex of the postcentral gyrus.

References

  1. ↑ Anthoney, T. R. (1993). Neuroanatomy and the neurologic exam: a thesaurus of synonyms, similar-sounding non-synonyms, and terms of variable meaning. CRC Press.

Sources

  • Siegel, A., & Sapru, H. N. (2006). Essential neuroscience. Lippincott Williams & Wilkins.
  • Norton, N. S. (2016). Netter's head and neck anatomy for dentistry. Elsevier Health Sciences.
  • Henssen D. J. H. A. (2016) "New Insights in Trigeminal Anatomy: A Double Orofacial Tract for Nociceptive Input" Frontiers in Neuroanatomy.


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