Hand Muscles

extensor indicis origin

posterior surface of distal shaft of ulna and interosseous membrane

extensor indicis insertion

tendon of extensor digitorum at 2nd metacarpal

extensor indicis action

extend and adduct 2nd finger at MCP

extensor indicis nerve

radial c6-8

abductor pollicis longus origin

posterior surface of radius and ulnar, interosseous membrane

abductor pollicis longus insertion

base of 1st metacarpal

abductor pollicis longus action

abduct, extend thumb and abduct wrist

abductor pollicis longus nerve

radial c6-8

extensor pollicis longus and brevis action

extend at MCP and CMC

EPL only extend at IP

abduct wrist

extensor pollicis longus and brevis nerve

radial c6-8

extensor pollicis longus origin

post surface of ulna and interosseous membrane

extensor pollicis longus insertion

base of distal phalanx of thumb

extensor pollicis brevis origin

post surface of radius and interosseous membrane

extensor pollicis brevis insertion

base of proximal phalanx of thumb

flexor pollicis longus origin

ant surface of radius and interosseous membrane

flexor pollicis longus insertion

base of distal phalanx of thumb

flexor pollicis longus action

flex thumb and assist in wrist flexion

flexor pollicis longus nerve

median c6-8, t1

abductor pollicis brevis origin

flexor retinaculum, trapezium, scaphoid tubercles

abductor pollicis brevis insertion

base of proximal phalanx of thumb

abductor pollicis brevis action

abduct thumb and assist opposition

abductor pollicis brevis nerve

median c6-8, t1

flexor pollicis brevis origin

superficial head - flexor retinaculum

deep head - trapezium, trapezoid, capitate

flexor pollicis brevis insertion

base of proximal phalanx

flexor pollicis brevis action

flex thumb and assist opposition

flexor pollicis brevis nerve

superficial - median c6-8, t1

deep - ulnar c8-t1

opponens pollicis origin

flexor retinaculum and tubercle of trapezium

opponens pollicis insertion

entire length of 1st metacarpal bone, radial surface

opponens pollicis nerve

median c6-8, t1

adductor pollicis origin

capitate, 2-3 metacarpals

adductor pollicis insertion

base of proximal phalanx of thumb

adductor pollicis nerve

ulnar c8 t1

lumbricals of the hand origin and insertion

surface of flexor digitorum profundus tendons to extensor aponeurosis on dorsal surface of digits

lumbricals action and nerve

extend 2-5 at IPs, flex at MCP

2-3 median, 4-5 ulnar

palmar interossei origin and insertion

base of 1, 2, 4, 5 metacarpals to base of proximal phalanx of same fingers

palmar inerossei action and nerve

adduct toward 3rd finger, assist flexion at MCP, and extend at IP

ulnar c8-t1

dorsal interossei origin and insertion

adjacent sides of all metacarpals to base of proximal phalanx’s of 2-4

dorsal interossei action and nerve

abduct 2-4 at MCP, flex 2-4 at MCP, extend 2-4 at IP

abductor digiti minimi origin and insertion

pisiform and tendon of FCU to base of prox phalanx

abductor digit minimi action and nerve

abduct and assist opposition

ulnar c7-8 t1

flexor digiti minimi brevis origin and insertion

hook of hamate and flexor retinaculum to

base of prox phalanx of 5th

flexor digiti minimi brevis action and nerve

flex and oppose

ulnar c7-8 t1

opponens digiti minimi origin and insertion

hook of hamate and flexor retinaculum to

shaft of 5th metacarpal

opponens digit minimi action and nerve

opposition

ulnar c7-8 t1