thumb

Question 1

thumb flexors

Answer 1

• flexor pollics longus

- flexor pollicis brevis

Question 2

flexor pollicis longus

1) origin
2) insertion
3) action

Answer 2

1) anterior surface of radius & interosseous membrane
deviation

2) distal phalanx of thumb
3) flexes distal phalanx of thumb

Question 3

abductor pollicis longus

1) origin
2) insertion
3) action

Answer 3

1) posterior surface of radius and ulna & interosseous membrane
2) base of 1st metacarpal and trapezium
3) abducts & extends thumb

Question 4

extensor pollicis brevis

1) origin
2) insertion
3) action

Answer 4

1) dorsal shaft of radius and ulna & interosseous membrane
2) base of proximal and distal phalanx of thumb
3) extends thumb

Question 5

opponens pollicis

1) location
2) action

Answer 5

1) metatcarpal 1 & thumb

2) opposition of thumb

Question 6

abductor pollicis brevis

1) location
2) action

Answer 6

1) proximal phalanx of thumb

2) abducts thumb

Question 7

flexor pollicis brevis

1) location
2) action

Answer 7

1) base of proximal phalanx of thumb

2) flexes thumb

Question 8

adductor pollicis

1) location
2) action

Answer 8

1) base of proximal phalanx of thumb

2) adducts & opposes thumb

Question 9

extensor pollicis longus

1) origin
2) insertion
3) action

Answer 9

1) posterior surface of middle ulna & interosseous membrane
2) base of distal phalanx of thumb
3) extends distal phalanx of thumb