|A.||Anterior interosseous nerve|
Posterior interosseous nerve
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:
– Thenar group (act on thumb)
– Hypothenar group (act on little finger)
– Adductor pollicis
– Interosseous muscles
– 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