pyramidal-tract

pyramidal tract

noun Anatomy.
any of four tracts of descending motor fibers that extend in pairs down each side of the spinal column and function in voluntary movement.

Origin:
1885–90

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American Heritage
Medical Dictionary

pyramidal tract n.
A massive bundle of fibers that originates from the motor cortex and the postcentral gyrus and emerges on the ventral surface of the medulla oblongata. Most of the fibers cross to the opposite side in the pyramidal decussation and descend the length of the spinal cord to innervate muscles of the extremities.

The American Heritage® Stedman's Medical Dictionary
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