Thumb and Hand Flashcards
Abductor Pollicis Longus
A: Abduct the thumb (carpometacarpal joint)
Extend the thumb (carpometacarpal joint)
Abduct the wrist (radiocarpal joint)
O: Posterior surface of radius and ulna, and interosseous membrane
I: Base of 1st metacarpal
N: Radial C6, 7, 8
Extensor Pollicis Longus and Brevis
A: Extend the thumb (interphalangeal joint)
Extend the thumb (metacarpophalangeal and carpometacarpal joint)
Abduct the wrist (radiocarpal joint)
O: Longus: posterior surface of ulna and interosseous membrane
Brevis: posterior surface of radius and interosseous membrane
I: Longus: Base of distal phalanx of thumb
Brevis: Base of proximal phalanx of thumb
N: Radial C6, 7, 8
Flexor Pollicis Longus
A: Flex the thumb (interphalangeal joint)
Flex the thumb (metacarpophalangeal and carpometacarpal joints)
Assist to flex the wrist (radiocarpal joint)
O: Anterior surface of radius and interosseous membrane
I: Base of distal phalanx of thumb
N: Median C(6), 7, 8, T1
Abductor Pollicis Brevis
A: Abduct the thumb (carpometacarpal and metacarpophalangeal joints)
Assist in opposition of the thumb
O: Flexor retinaculum, trapezium and scaphoid tubercles
I: Base of proximal phalanx of thumb
N: Median C6, 7, 8, T1
Flexor Pollicis Brevis
A: Flex the thumb (carpometacarpal and metacarpophalangeal joints)
Assist in opposition of the thumb
O: Superficial head: Flexor retinaculum
Deep head: Trapezium, trapezoid and capitate
I: Base of proximal phalanx of thumb
N: Superficial head: Median C6, 7, 8, T1
Deep head: Ulnar C8, T1
Opponens Pollicis
A: Opposition of the thumb at the carpometacarpal joint
O: Flexor retinaculum and tubercle of the trapezium
I: Entire length of first metacarpal bone, radial surface
N: Median C6, 7, 8, T1
Adductor Pollicis
A: Adduct the thumb (carpometacarpal and metacarpophalangeal joints)
Assist to flex the thumb (metacarpophalangeal joint)
O: Capitate, second and third metacarpals
I: Base of proximal phalanx of thumb
N: Ulnar C8, T1
