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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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for pyramidal tract
Historical Examples
  • They included portions of all the tracts, the pyramidal tract as well.

    Arteriosclerosis and Hypertension: Louis Marshall Warfield
  • In the reflex, the lower center is aroused by a sensory nerve, and in the voluntary movement by the pyramidal tract.

    Psychology Robert S. Woodworth
  • These are cerebral influences acting by way of the pyramidal tract upon the spinal center for the reflex.

    Psychology Robert S. Woodworth
pyramidal tract in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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