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A "motor homunculus" can be visualized as an overlay on the precentral gyrus. The reason why the facial region of this homunculus covers such a large surface area is because
(A) our ears are large for hearing.
(B) our eyes are large for seeing.
(C) we have very expressive faces.
(D) we have very sensitive lips.

Respuesta :

Answer: the correct answer is (C) we have very expressive faces.

Explanation:

A cortical homunculus is a distorted representation of the human body based on a "neurological map" of the areas and proportions of the human brain.

The correct option is ( c) we have very expressive faces.

  • The homunculus in the sensory cortex is almost invisible to humans.
  • The face and hands are drawn larger than the torso, arms, and legs.
  • This is because the brain maps each sensory receptor to the cortex rather than considering the area of ​​the body where the sensor is located.

Why is the motor homunculus significant?

  • The motor homunculus represents a map of the brain region dedicated to the motor processing of the various anatomical divisions of the body.
  • The primary motor cortex is located in the precentral gyrus and processes signals coming from the premotor cortex of the frontal lobe.

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