What is the difference between the sensory homunculus and the motor homunculus?
A) The sensory homunculus is in the frontal lobe and the motor homunculus is in the parietal lobe.
B) The sensory homunculus receives input from the substantia nigra and the motor homunculus receives input from the basal ganglia.
C) The sensory homunculus devotes more cortical space to areas of the body that are more sensitive, and the motor homunculus devotes more cortical space to areas of the body that require more dexterous movements.
D) The sensory homunculus is fed by efferent fibres and the motor homunculus is fed by afferent fibres.

Question

Quizplus · Accepted Answer

The sensory homunculus and motor homunculus are both representations of the human body in the brain. The sensory homunculus represents the sensory input and devotes more cortical space to areas of the body that are more sensitive, while the motor homunculus represents the motor output and devotes more cortical space to areas of the body that require more dexterous movements. Option A is incorrect because both homunculi are located in the parietal lobe, specifically in the postcentral gyrus for the sensory homunculus and precentral gyrus for the motor homunculus. Option B is incorrect because both homunculi receive input from the primary sensory and motor cortices in the brain, not from the substantia nigra or basal ganglia. Option D is incorrect because the opposite is true: the sensory homunculus receives input from afferent fibers and the motor homunculus is fed by efferent fibers.

What Is the Difference Between the Sensory Homunculus and the Motor