Muscles of the Hand and Wrist

 

Muscle Innervation Origin Insertion Action Nerve Root
Thenar Muscles          
Abductor pollicis brevis (APB) median Scaphoid, trapezoid base of proximal phalanx, radial side abduct thumb  C8, T1
Opponens pollicis median trapezium thumb metacarpal abduct, flex, med. Rotation  C8, T1
Flexor pollicis brevis (FPB) median(superficial head), ulnar(deep head) trapezium, capitate base of proximal phalanx, radial side flex MCP  C7, C8
Adductor pollicis Ulnar capitate, 2nd/3rd metacarpals base of proximal phalanx, ulnar side Adduct thumb  C8, T1
Hypothenar Muscles          
Palmaris Brevis (PB) ulnar TCL, palmar aponeurosis Ulnar palm Retract skin  
Abductor dibiti minimi ulnar pisiform base of proximal phalanx, ulnar side abduct small finger  C8, T1
Flexor digiti minimi brevis(FDMB) Ulnar hamate, TCL base of proximal phalanx, ulnar side flex MCP  C8, T1
Opponens digiti minimi(ODM) Ulnar hamate, TCL small finger metacarpal abduct, flex, lat rotation  C8, T1
Intrisinsic Muscles          
Lumbricals median, ulnar(ulnar two) flexor digitorum profundus(FDP) lateral bands(radial) extend PIP  
Dorsal interosseous(DIO)(DAB) Ulnar adjacent metacarpals proximal phalanx base/extensor apparatus abduct, flex MCP  C8, T1
Volar interosseous(VIO) Ulnar adjacent metacarpals proximal phalanx base/extensor apparatus Adduct, flex MCP  C8, T1