spinothalamic tract

noun

Medical Definition of spinothalamic tract

: any of four tracts of nerve fibers of the spinal cord that are arranged in pairs with one member of a pair on each side and that ascend to the thalamus by way of the brain stem:

a : one on each side of the anterior median fissure that carries nerve impulses relating to the sense of touch

— called also anterior spinothalamic tract, ventral spinothalamic tract

b : one on each lateral part of the spinal cord that carries nerve impulses relating to the senses of touch, pain, and temperature

— called also lateral spinothalamic tract

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