Exam 2 Muscles - Hand

Question 1

Origin of abductor pollicis brevis

Answer 1

Flexor retinaculum, schapoid, trapezium,

Question 2

Insertion of abductor pollicis brevis

Answer 2

Base of proximal phalanx of thumb (via radial sesamoid)

Question 3

Innervation of abductor pollicis brevis

Answer 3

Median nerve (C8-T1)

Question 4

Action of abductor pollicis brevis

Answer 4

CMC joint of thumb: abduction

Question 5

Origin of flexor pollicis brevis

Answer 5

Superficial head - flexor retinaculum

Deep head - Trapezium and capitate bones

Question 6

Insertion of flexor pollicis brevis

Answer 6

Base of proximal phalanx of thumb (via radial sesamoid)

Question 7

Innervation of flexor pollicis brevis

Answer 7

Superficial head - median nerve (C8-T1)

Deep head - ulnar nerve (C8-T1)

Question 8

Action of flexor pollicis brevis

Answer 8

CMC joint of thumb: flexion

Question 9

Origin of opponens pollicis

Answer 9

Trapezium

Question 10

Insertion of opponens pollicis

Answer 10

First metacarpal (radial border)

Question 11

Innervation of opponens pollicis

Answer 11

Median n (C8-T1)

Question 12

Action of opponens pollicis

Answer 12

CMC joint of thumb - opposition

Question 13

Origin of adductor pollicis

Answer 13

Transverse head - 3rd metacarpal (palmar surface)

Oblique head - Base of 2nd and 3rd metacarpals; Capitate

Question 14

Insertion of adductor pollicis

Answer 14

Base of proximal phalanx of thumb (via ulnar sesamoid)

Question 15

Innervation of adductor pollicis

Answer 15

Ulnar nerve (C8-T1)

Question 16

Action of adductor pollicis

Answer 16

CMC joint of thumb: adduction

MCP joint of thumb: flexion

Question 17

Hypothenar muscles

Answer 17

Opponens digiti minimi, Flexor digiti minimi brevis, Abductor digiti minimi

Question 18

Origin of opponens digiti minimi

Answer 18

Flexor retinaculum, Hook of hammate

Question 19

Insertion of opponens digiti minimi

Answer 19

Fifth metacarpal (Ulnar border)

Question 20

Innervation of opponens digiti minimi

Answer 20

Ulnar nerve (C8-T1)

Question 21

Action of opponens digiti minimi

Answer 21

Opposition

Question 22

Origin of flexor digiti minimi brevis

Answer 22

Flexor retinaculum, hook of hammate

Question 23

Insertion of flexor digiti minimi brevis

Answer 23

Base of fifth proximal phalanx

Question 24

Innervation of flexor digiti minimi brevis

Answer 24

Ulnar nerve (C8-T1)

Question 25

Action of flexor digiti minimi brevis

Answer 25

MCP joint of little finger: flexion

Question 26

Origin of abductor digiti minimi

Answer 26

Pisiform bone

Question 27

Insertion of abductor digiti minimi

Answer 27

• Fifth proximal phalanx (base)

- Dorsal digital expansion

Question 28

Innervation of abductor digiti minimi

Answer 28

Ulnar nerve (C8-T1)

Question 29

Action of abductor digiti minimi

Answer 29

MCP joint of little finger: flexion and abduction

PIP and DIP joints of little finger - extension

Question 30

origin of palmaris brevis

Answer 30

Palmar aponeurosis

Question 31

Insertion of palmaris brevis

Answer 31

Skin of hypothenar eminence

Question 32

Innervation of palmaris brevis

Answer 32

Ulnar nerve (C8-T1)

Question 33

Action of palmaris brevis

Answer 33

Tighten the palmar aponeurosis (protective function)

Question 34

Thenar muscles

Answer 34

Abductor pollicis brevis, flexor pollicis previs, opponens pollicis, adductor pollicis