Hand Muscles Anatomy

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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
Opponens pollicis- Medially rotates thumb- Tubercle of trapezium and flexor retinaculum- Lateral margin of 1st metacarpal- Recurrent branch of median nerve: C8,T1- Superficial palmar branch of radial artery
Abductor pollicis brevis- Abducts thumb - Flexor retinaculum
- Tubercles of scaphoid and trapezium
- Lateral base of proximal phalanx of thumb- Reccurent branch of median nerve: C8,T1- Superficial palmar branch of radial artery
Flexor pollicis brevis- Flexes thumb- Flexor retinaculum
- Tubercles of scaphoid and trapezium
- Lateral base of proximal phalanx of thumb- Reccurent branch of median nerve: C8,T1- Superficial palmar branch of the radial artery
Opponens digiti minimi- Laterally rotates and anteriorly draws 5th metacarpal to opposition with thumb- Hook of hamate
- Flexor retinaculum
- Medial border 5th metacarpal- Deep branch of ulnar nerve: C8,T1- Ulnar 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
Flexor digiti minimi brevis- Flexes proximal phalanx of little finger- Hook of hamate
- Flexor retinaculum
- Medial base of proximal phalanx of little finger- Deep branch of ulnar nerve- Ulnar artery