upper motor neuron
A motor neuron whose cell body is located in the motor area of the cerebral cortex and whose processes connect with motor nuclei in the brainstem or the anterior horn of the spinal cord.
A Brief History Of Writing InstrumentsThe quill fueled most written communication from the 6th to the 19th century. Quills were made of hollow bird feathers, most commonly goose feathers.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.