Structures

  • Dorsal interossei
  • Abductor pollicis longus
  • Abductor pollicis brevis
  • Abductor digiti minimi
MuscleActionOriginInsertionInnervationBlood supply
Dorsal interossei- Abduct digits from axial line at metacarpophalangeal joints- Adjacent sides of metacarpals- Extensor expansions and bases of proximal phalanges of digits 2-4- deep branch of ulnar nerve: C8,T1- Dorsal and Palmar metacarpal arteries
Abductor pollicis longus- Abducts and extends thumb at carpometacarpal joint- Posterior surface of ulna, radius and interosseous membrane- Base of 1st metacarpal- Posterior interosseous nerve: C7,8- Posterior interosseous artery
Abductor pollicis brevis- Abducts thumb- Lateral base of proximal phalanx of thumb- Lateral Base of proximal phalanx of thumb- Reccurent branch of median nerve: C8,T1- Superficial Palmar branch of radial artery
Abductor digiti minimi- Abducts little finger- Pisiform- medial Base of proximal phalanx of little finger- deep branch of ulnar nerve: C8,T1- Ulnar artery