- See:
- Intrinsic Muscles of the Hand
- origin: each from the 2 metacarpal bones between which it inserts;
- insertion:
- proximal phalanges of the 2nd, 3rd, and 4th digits & posterior expansion of the finger extensor tendons;
- action:
- 1st abducts index finger, the 2nd radially flexes middle finger, 3rd flexes middle finger & 4th abducts the ring finger;
- all assists in flexing proximal phalanges of index, middle and ring fingers at metacarpophalangeal joints;
- nerve supply: palmar branch of [ulnar nerve, C8 , T1
- synergists: lumbrical, Palmar Interossei , FDP, FDS
Movement patterns of interosseus-minus fingers.
Abductor pollicis longus transfer for replacement of first dorsal interosseous.