The flexor digiti minimi brevis is one of the intrinsic muscles of the hand within the hypothenar group.
The hypothenar muscles are innervated by the deep branch of the ulnar nerve, the thenar group are innervated by the recurrent branch of the median nerve.
The intrinsic muscles of the hand are involved with precision movements and consist of the following muscles:
- Thenar muscles: flexor pollicis brevis, abductor pollics brevis, opponens pollicis
- Hypothenar muscles: abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi
- Interosseus muscles
- Other: palmaris brevis, adductor pollicis
The intrinsic muscles of the hand are innervated by the deep branch of the ulnar nerve, except the thenar muscles and the lateral two lumbricals. A mnemonic for remembering this is Meat LOAF, Meat = Median nerve innervates the Lateral lumbricals, Opponens pollicis, Abductor pollicis brevis and Flexor pollicis brevis
- Hook of the hamate and adjacent flexor retinaculum
- Medial base of proximal phalanx of little finger (same as abductor digiti minimi)`
- Flexion of the little finger (at the little finger metacarpophalangeal joint)
- Deep Branch of Ulnar Nerve
- Deep palmar arch (from ulnar artery)