Within the homunculus, what does a larger area on the primary motor cortex correspond to?

• A. More motor control for that body part.
• B. Less motor control for that body part.
• C. More sensation for that body part.
• D. Less sensation for that body part.

Answer: (A)

Verified step by step guidance

1. Understand the concept of the homunculus: The homunculus is a visual representation of the body within the brain, specifically in the primary motor cortex and the somatosensory cortex.
2. Identify the role of the primary motor cortex: The primary motor cortex is responsible for voluntary motor control of the body.
3. Recognize the significance of area size in the homunculus: In the homunculus, a larger area on the primary motor cortex indicates greater motor control and precision required for that body part.
4. Differentiate between motor and sensory functions: The primary motor cortex is associated with motor control, not sensation, which is handled by the somatosensory cortex.
5. Conclude the relationship: Therefore, a larger area on the primary motor cortex corresponds to more motor control for that body part, as it requires more neural resources for precise movements.