Hand muscles

Question 1

Abductor pollicis brevis

Answer 1

Abducts thumb at the metacarpophalangeal joint, helps opposition; median nerve

Question 2

Flexor pollicis brevis

Answer 2

Flexes thumb at the carpometacarpal joint (strong)

and metacarpophalangeal joint (weak); superficial head innervated by median n, deep head by ulnar

Question 3

Opponens pollicis

Answer 3

Opposes thumb with other digits; median nerve

Question 4

Adductor pollicis

Answer 4

Adducts thumb at the metacarpophalangeal joint; ulnar nerve

Question 5

Abductor digiti minimi

Answer 5

Abducts 5th digit, assists in flexion of its proximal phalanx; ulnar n

Question 6

Flexor digiti minimi brevis

Answer 6

Flexes proximal phalanx of 5th digit; ulnar n

Question 7

Opponens digiti minimi

Answer 7

Brings 5th digit into opposition with the thumb

Question 8

Lumbricals

Answer 8

Flex metacarpophalangeal joints, extend interphalangeal joints of 2nd to 5th digits; the 1st and the 2nd by the median n and the 3rd and 4th by the ulnar n

Question 9

Interossei

Answer 9

Dorsal interossei abducts the digits, Palmar interossei adducts the digits; Ulnar n