WK7,8- Hand Muscles

Question 1

Name the O, I, I, A for the following muscle: abductor pollicis brevis

Answer 1

O: flexor retinaculum, scaphoid, trapezium
I: base of proximal 1st phalanx
I: Median
A: abducts digit 1

Question 2

Name the O, I, I, A for the following muscle: Opponens Pollicis

Answer 2

O: flexor retinaculum, scaphoid, trapezium
I: lateral border of metacarpal 1
I: median nerve
A: opposition of thumb

Question 3

Name the O, I, I, A for the following muscle: Flexor pollicis brevis

Answer 3

O: superficial head: flexor retinaculum and trapezium. Deep head: trapezium trapezoid and capitate
I: radial side of the base of digit 1
I: median nerve and deep branch of the ulnar nerve
A: flexor proximal phalanx of digit 1

Question 4

Name the O, I, I, A for the following muscle: Adductor pollicis

Answer 4

O: metacarpals 2 and 3 and the carpal bones
I: medial surface of the base of the proximal phalanx of digit 1
I: ulnar nerve
Action: adduction of digit 1

Question 5

Name the O, I, I, A for the following muscle: abductor digiti minimi

Answer 5

O: pisiform
I: medial side of proximal 5th phalanx
I: ulnar nerve
A: abducts digit 5

Question 6

Name the O, I, I, A for the following muscle: flexor digiti minimi brevis

Answer 6

O: hook of hamate and the flexor retinaculum
I: base of the proximal phalanx of digit 5
I: deep ulnar branch
A: flexion of digit 5

Question 7

Name the O, I, I, A for the following muscle: opponens digiti minimi

Answer 7

O: hook of hamate
I: ulnar border of the 5th metacarpal
I: ulnar nerve
A: opposition of digit 5

Question 8

Name the O, I, I, A for the following muscle: lumbricals

Answer 8

O: tendons of FDP
I: extensor expansion of the same digit
I: median (1,2) and ulnar nerve (3,4)
A: flexes MCP joint, extends DIP and PIP

Question 9

Name the O, I, I, A for the following muscle: Palmar Interossei

Answer 9

O: head from the metacarpals of 2, 4,5
I: dorsal digital expansion of 2,4,5
I: ulnar nerve deep branch
A: flexion of MCP joint 2-5,

Question 10

Name the O, I, I, A for the following muscle: dorsal interossei

Answer 10

O: tow heads from the adjacent sides of the metacarpal bones
I: base of the proximal phalanges and dorsal expansions of digits 2-4
I: ulnar nerve, deep branch
A: abduction of MCP joint 2 and 4, flexion of MCP 2-5, ext of 2-5