Image Based Question – 73116

What is the Nerve Supply of marked structure in the given image:

A. Anterior interosseous nerve

B. Posterior interosseous nerve

C. Ulnar nerve

D. Median nerve

Correct Answer » D Explanation

Answer D. Median nerve

The structure indicated is the first lumbrical muscle of the hand.

• The lumbricals belong to the intrinsic group of muscles which act on the hand.

• The intrinsic muscles include the following muscles/groups:

1. Thenar group (act on thumb)

2. Hypothenar group (act on little finger)

3. Adductor pollicis

4. Lumbricals

5. Interosseous muscles

6. Palmaris brevis

• All the intrinsic muscles of the hand, except the thenar muscles and the lateral two lumbrical muscles are innervated by the deep branch of the ulnar nerve.
• The thenar muscles and the lateral two lumbrical muscles are innervated by the median nerve.
• A useful mnemonic for remembering this is MEATLOAF. “MEAT” refers to the Median nerve, and LOAF refers to the muscles which it innervates: Lateral two lumbricals, Opponens pollicis, Abductor pollicis brevis, Flexor pollicis brevis