Nasir is looking at a picture of a human motor homunculus in his textbook. Which body part would have the largest representation in the primary motor cortex?
A) the back
B) the legs
C) the lips
D) the toes

Question

Quizplus · Accepted Answer

The primary motor cortex is responsible for voluntary movements, and the size of each body part's representation corresponds to the complexity and precision of movement required. The hands, lips, and tongue have the largest representations in the primary motor cortex because they require intricate and precise movements. The back and legs have smaller representations because they have less fine motor control. The toes have the smallest representation because they require less complexity of movement than other body parts. Therefore, C (the lips) would have the largest representation.

Nasir Is Looking at a Picture of a Human Motor