hand muscles Flashcards
what muscles are in the thenar group
flexor pollicis brevis
abductor pollicis brevis
opponens pollicis
thenar group origin
o - flexor retinaculum, scaphoid, trapezium
flexor pollicis brevis origin and insertion
o - flexor retinaculum, scaphoid, trapezium
i - medial proximal phalanx 1
flexor pollicis brevis action
flex thumb at CMC and MCP
abductor pollicis brevis origin and insertion
o - flexor retinaculum, scaphoid, trapezuim
i - lateral proximal phalanx 1
abductor pollicis brevis action
abduct thumb at CMC
opponens pollicis origin and insertion
o - flexor retinaculum, scaphoid, trapezium
i - lateral aspect 1st metacarpal
opponens pollicis action
opposes thumb at CMC joint
adductor pollicis origin and insertion
o - oblique head - base of 2nd and 3rd metacarpal
transverse head - anterior surface of 3rd metacarpal
i - medial base of 1st proximal phalanx
adductor pollicis action
adduct thumb at CMC
hypothenar group muscles
flexor digiti minimi brevis
abductor digiti minimi brevis
opponens digiti minimi
flexor digiti minimi brevis origin and insertion
o - hamate (hook) and flexor retinaculum
i - base of 5th proximal phalanx
flexor digiti minimi brevis action
flex digit 5 at MCP joint
abductor digiti minimi brevis origin and insertion
o - pisiform
i - meidal 5th proximal phalanx
abductor digiti minimi brevis action
abduct digit 5 at MCP
opponens digiti minmi origin and insertion
o - hamate and flexor retinaculum
i - medial 5th metacarpal
opponens digiti minimi action
opposes digit 5 at CMC joint
lumbricals origin and insertion
o - tendons of flexor digitorum profundus digits 2-5
i - extensor expansion digits 2-5
lumbricals action
flex MCP and extend PIP and DIP digits 2-5
dorsal interossei origin and insertion
o - adjacent metacarpals
i - bases of proximal phalanges and extensor expansion digits 2-4
dorsal interossei action
abduct digits 2-4 at MCP
palmar interossei origin and insertion
o - 2nd, 4th, 5th metacarpals
i - bases of proximal phalanges and extensor expansion digits 2, 4, 5
palmar interossei action
adduct digits 2, 4, 5 at MCP
which hand muscles are innervated by median N
thenar group and lumbricals 1, 2
which hand muscles are innervated by ulnar N
adductor pollicis
hypothenar group
lumbricals 3,4
dorsal and palmar interossei
