Descending (Motor) Pathways Always Involve at Least ________ Motor Neuron(s)

Question

Descending (motor) pathways always involve at least ________ motor neuron(s).
A) one
B) two
C) three
D) four
E) spinal

Accepted Answer

Descending motor pathways always involve at least two motor neurons: an upper motor neuron that descends from the cerebral cortex or brainstem to the spinal cord or brainstem, and a lower motor neuron that goes from the spinal cord or brainstem to the muscle fibers.