| 单词 | pyramidal tract |
| 释义 | pyramidal tractnoun 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 tractFirst recorded in 1885–90 Words nearby pyramidal tractpyramidal muscle, pyramidal muscle of auricle, pyramidal orchid, pyramidal peak, pyramidal radiation, pyramidal tract, pyramid bet, pyramidical, pyramidion, pyramid letter, pyramid of light Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Medical definitions for pyramidal tractpyramidal 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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