HAE Quiz 3: Intrinsic Muscles of the Hand

Question 1

Flexor pollicis brevis

Answer 1

O: flexor retinaculum, lateral carpals
I: proximal phalanx of thumb
N: recurrent branch of median nerve
F: flexes thumb

Question 2

Abductor pollicis brevis

Answer 2

O: Flexor retinaculum, lateral carpals
I: proximal phalanx of thumb
N: recurrent branch of median nerve
F: abducts thumb

Question 3

Opponens pollicis

Answer 3

O: flexor retinaculum, lateral carpals
I: 1st metacarpal
N: recurrent branch of median nerve
F: opposes thumb

Question 4

Adductor pollicis

Answer 4

O: 3rd metacarpal, carpals
I: proximal phalanx of thumb
N: deep branch of ulnar nerve
F: adducts thumb

Question 5

Flexor digiti minimi brevis

Answer 5

O: flexor retinaculum, medial carpals
I: proximal phalanx of little finger
N: deep branch of ulnar nerve
F: flexes little finger (at MP joint)

Question 6

Abductor digiti minimi

Answer 6

O: medial carpals
I: proximal phalanx of little finger
N: deep branch of ulnar nerve
F: abducts little finger

Question 7

Opponens digiti minimi

Answer 7

O: flexor retinaculum, medial carpals
I: 5th metacarpal
N: deep branch of ulnar nerve
F: opposes little finger

Question 8

Lumbricals

Answer 8

O: tendons of flexor digitorum profundus
I: extensor expansions of digits 2-5
N: 1 and 2- median nerve; 3 and 4- deep branch of ulnar nerve
F: flex digits at MP joints, extend digits at IP joints

Question 9

Dorsal interossei

Answer 9

O: metacarpals
I: extensor expansions and proximal phalanges of digits 2-4
N: deep branch of ulnar nerve
F: abducts digits 2-4

Question 10

Palmar interossei

Answer 10

O: metacarpals
I: extensor expansions and proximal phalanges of digits 2, 4 and 5
N: deep branch of ulnar nerve
F: adducts digits 2, 4, 5