A ʺMotor Homunculusʺ Can Be Visualized as an Overlay on the Precentral

question 3

Multiple Choice

A ʺmotor homunculusʺ 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) we have very expressive faces.
• B) we have very sensitive lips.
• C) our eyes are large for seeing.
• D) our ears are large for hearing.

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Definitions:

Sacrum

A large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones.

Vertebrae

The individual bones that make up the vertebral column (backbone) in vertebrates.

Intervertebral Disk

A fibrocartilaginous structure located between the vertebrae of the spine, acting as a shock absorber and allowing for flexibility.

Sciatica

A condition of pain going down the leg from the lower back, caused by irritation or compression of the sciatic nerve.