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 of pyramidal tract

First recorded in 1885–90

Words nearby pyramidal tract

pyramidal muscle, pyramidal muscle of auricle, pyramidal orchid, pyramidal peak, pyramidal radiation, pyramidal tract, pyramidical, pyramidion, pyramids, pyramine, pyramus and thisbe

Medical definitions for pyramidal tract

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.