In studying the functional relationships between the motor cortex and the spinal cord, which of the following effects of cortical stimulation on synaptic potentials would an investigator be likely to observe?

a. The largest potentials would be seen in spinal motor neurons that innervate proximal muscles

b. The largest potentials would be seen in spinal motor neurons that innervate distal muscles

c. The potentials seen in spinal motor neurons that innervate proximal and distal muscles would be approximately equivalent

d. The largest potentials would be seen in spinal sensory neurons that carry information from spindle afferents to the cerebellum

e. The largest potentials would be seen in spinal sensory neurons that carry information from proprioceptors to the thalamus