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The lateral spinothalamic tract (or lateral spinothalamic fasciculus), is a bundle of afferent nerve fibers ascending through the white matter of the spinal cord, in the spinothalamic tract, carrying sensory information to the brain. It carries pain, and temperature sensory information (protopathic sensation) to the thalamus.
The anterolateral system (ALS) is a bundle of afferent somatosensory fibers from different ascending tracts in the spinal cord. These fibers include those of the spinomesencephalic tract, spinothalamic tract, and spinoreticular tract amongst others. [5]
However, the trigeminal lemniscus also carries pain and temperature sensations from the contralateral orofacial region, just as the spinothalamic tract carries these sensations from the contralateral body. Thus, the trigeminal lemniscus of the head is functionally analogous to both the DCML tracts and the spinothalamic tract of the body.
Note that a lesion of the lateral spinothalamic tract at a given level will not result in sensory loss for the dermatome of the same level; this is due to the fibers of the tract of Lissauer which transmit the neuron one or two levels above the affected segment (thus bypassing the segmental lesion on the contralateral side).
The loss of the spinothalamic tract leads to pain and temperature sensation being lost from the contralateral side beginning one or two segments below the lesion. In addition, if the lesion occurs above T1 of the spinal cord it will produce ipsilateral Horner's syndrome with involvement of the oculosympathetic pathway.
The axons of neurons contribute to the lateral spinothalamic tract. [3] [4] References This page was last edited on 18 August 2024, at 16:17 (UTC). ...
These interneurons then synapse with second-order neurons in laminae V-VIII [1] Their axons then ascend in the spinal cord near the lateral spinothalamic tract. [2] A minority of second-order axons of the spinoreticular tract bypass the reticular formation, and project directly to the intralaminar thalamic nuclei.. [1] [page needed]
Lateral spinothalamic tract; Anterior spinothalamic tract; ... Body of lateral ventricle; Inferior horn; Posterior horn. Calcar avis; Subventricular zone; Third ...