The primary motor cortex for the lower limb is located in which gyrus and receives its blood supply predominantly from which artery?

• A Postcentral gyrus lateral surface; middle cerebral artery
• B Precentral gyrus lateral surface; middle cerebral artery
• C Precentral gyrus medial surface; anterior cerebral artery ✓
• D Cingulate gyrus; anterior cerebral artery

Explanation

The primary motor cortex occupies the precentral gyrus (Brodmann area 4). The homunculus representation of the lower limb is located on the medial surface of the hemisphere within the paracentral lobule, which is supplied by the anterior cerebral artery. Lateral precentral gyrus (face and upper limb) is supplied by the middle cerebral artery.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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