Thenareminence

Question 1

Abductor Pollicis Brevis origin and insertion

Answer 1

Origin- retinaculum of, trapezium and scaphoid tubercles

Insertion- base of proximal phalanx of thumb

Question 2

Abductor Pollicis Brevis action

Answer 2

Abduct the thumb; assist in opposition of thumb

Question 3

Flexor Pollicis Brevis origin and insertion

Answer 3

Origin- superficial head: flexor retinaculum
Deep head: trapezium, trapezoid and capitate

Insertion: base of proximal phalanx of thumb

Question 4

Flexor Pollicis Brevis action

Answer 4

Flex the thumb; assist in opposition of thumb

Question 5

Opponens Pollicis origin and insertion

Answer 5

Origin- flexor retinaculum and tubercle of trapezium

Insertion- entire length of 1st metacarpal bone, radial surface

Question 6

Opponens Pollicis action

Answer 6

Opposition of thumb at carpometacarpal joint

Question 7

Adductor Pollicis origin and insertion

Answer 7

Origin- capitate, second and third metacarpals

Insertion- base of proximal phalanx of thumb

Question 8

Adductor Pollicis action

Answer 8

Adduct thumb; assist to flex the thumb