Palmar Interossei 

- 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.

 Architectural design of the human intrinsic hand muscles.

Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, December 15, 2011 11:01 am