The Motor Homunculus Shows Larger Structures in Areas of the Body

Question

The motor homunculus shows larger structures in areas of the body that
A) have more surface area.
B) have more sensory receptors.
C) have bigger skeletal muscles.
D) are highly sensitive.
E) have more motor units.

Accepted Answer

The motor homunculus represents the relative amount of motor cortex devoted to each body part. Larger structures in the motor homunculus correspond to body parts with more motor units, indicating a greater degree of control over fine motor movements, not necessarily the size of the body part, its muscle mass, or sensitivity.