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The anterior and lateral spinothalamic tracts labelled at lower right as tracts of the anterolateral system. There are two main parts of the spinothalamic tract: The lateral spinothalamic tract transmits pain and temperature. The anterior spinothalamic tract (or ventral spinothalamic tract) transmits crude touch and firm pressure.
Anterior part of Lateral nucleus; Part of supraoptic nucleus; Other nuclei of preoptic area. ... Lateral spinothalamic tract; Anterior spinothalamic tract;
Two of the five sensory modalities, pain and temperature, cross sides at the anterior white commissure, reaching the contralateral side about two vertebral levels rostral to their origin. The spinothalamic tract thus decussates very soon after entering the spinal cord, ascending in the spinal cord, contralateral to the side from where it ...
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]
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]
After synapsing, secondary axons decussate and ascend in the anterior lateral portion of the spinal cord as the spinothalamic tract. This tract ascends all the way to the VPLN, where it synapses on tertiary neurons. Tertiary neuronal axons then travel to the primary sensory cortex via the posterior limb of the internal capsule.
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).
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.