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Which of the following statements concerning the primary motor area is true?Multiple ChoiceThe area that controls the thumb, fingers, and hand is larger than the area controlling the leg.The primary motor area is located anterior to the central sulcus.Control of muscles responsible for facial movements take up a large portion of the primary motor area.Voluntary commands to skeletal muscles begin in the primary motor area.All of the answer choices are true.

Question

Which of the following statements concerning the primary motor area is true?Multiple ChoiceThe area that controls the thumb, fingers, and hand is larger than the area controlling the leg.The primary motor area is located anterior to the central sulcus.Control of muscles responsible for facial movements take up a large portion of the primary motor area.Voluntary commands to skeletal muscles begin in the primary motor area.All of the answer choices are true.

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Solution

All of the answer choices are true.

  1. The area that controls the thumb, fingers, and hand is larger than the area controlling the leg. This is true because the hand and fingers require more precise control than the leg, so they have a larger representation in the primary motor area.

  2. The primary motor area is located anterior to the central sulcus. This is also true. The primary motor area is located in the precentral gyrus, which is just anterior (in front of) the central sulcus.

  3. Control of muscles responsible for facial movements take up a large portion of the primary motor area. This is true because facial movements require a lot of precise control, so they have a large representation in the primary motor area.

  4. Voluntary commands to skeletal muscles begin in the primary motor area. This is true. The primary motor area is responsible for initiating voluntary movements by sending signals to the muscles.

So, all of the answer choices are true.

This problem has been solved

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