pyramidal tract

American  

noun

Anatomy.

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

---

Etymology

Origin of pyramidal tract

First recorded in 1885–90

Example Sentences

Excitatory pyramidal tract neurons, which reside in a region called layer 5 in the anterior lateral motor cortex, communicate with other neurons located many thousands of cell diameters away by establishing physical contacts.

From Nature

The direct pyramidal tracts occur only in man and man-like apes.

From Project Gutenberg

It seems to produce a sclerosis of the pyramidal tracts of the cord.

From Project Gutenberg

They included portions of all the tracts, the pyramidal tract as well.

From Project Gutenberg

In some so much of the pyramidal tract remains uncrossed that there may be decided weakness on the same side as the lesion in the brain.

From Project Gutenberg