Structures

  • Palmaris brevis
  • Dorsal interossei
  • Palmar interossei
  • Adductor pollicis
  • Lumbricals

MuscleActionOriginInsertionInnervationBlood supply
Palmaris brevis- Improves grip- Palmar aponeurosis
- Flexor retinaculum
- Dermis of skin on medial hand margin- Superficial branch ulnar nerve: C8,T1- Palmar metacarpal artery of the deep palmar arch
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
Palmar interossei- Adduct digits toward axial line at metacarpophalangeal joints- Sides of metacarpals- Extensor expansions of digits and bases of proximal phalanges of digits 2-5- Deep branch of ulnar nerve: C8,T1- Palmar metacarpal arteries
Adductor pollicis- Adducts thumb- Oblique head: Capitate and bases of metacarpals 2 and 3
- Transverse head: metacarpal 3
- Base of proximal phalanx and extensor expansion of thumb- Deep branch of ulnar nerve: C8,T1- Deep palmar arterial arch
Lumbricals- Flexion of metacarpophalangeal joints
- Extend interphalangeal joints
- Tendons of flexor digitorum profundus- Extensor expansions of digits 2-5- Medial two: Deep branch of ulnar nerve
- Lateral two by digital branches of median nerve
- Superficial palmar arch
- Common palmar digital artery
- Deep palmar arch
- Dorsal digital artery