Only primates and a few other species,such as hamsters and raccoons,have cortical neurons that synapse directly on
A) muscles.
B) muscles of the fingers and thumb.
C) motor neurons that project to the muscles of the fingers and thumb.
D) spinal interneurons.
E) targets in the PNS.

Question

Quizplus · Accepted Answer

Cortical neurons that synapse directly on motor neurons in the spinal cord that project to the muscles of the fingers and thumb are called corticomotoneuronal cells (CMNs). Only primates and a few other species, such as hamsters and raccoons, have these cells, which allow for fine motor control and dexterity in the fingers and hands.

Only Primates and a Few Other Species,such as Hamsters and Raccoons,have