The disproportionate cortical representation in the primary motor cortex of the fingers and mouth is due to the fact that
A) the hands and mouth take more innervation to move.
B) are less sensitive than other areas of the body.
C) are more sensitive than other areas of the body.
D) require greater precision of movement.
E) require less precision of movement.

Question

Quizplus · Accepted Answer

The disproportionate cortical representation of the fingers and mouth in the primary motor cortex is due to the need for greater precision of movement in these areas. This is because the fingers and mouth are involved in fine motor movements, such as writing and speech, which require more precise control than movements of other body parts.

The Disproportionate Cortical Representation in the Primary Motor Cortex of the Fingers