Muscles of the Thumb and Hand

Question 1

Action - ABductor Pollicus Longus

Answer 1

ABduct the thumb
Extend the thumb
ABduct the wrist

Question 2

Origin - ABductor Pollicus Longus

Answer 2

Posterior surface of the radius and ulna and the interosseous membrane

Question 3

Insertion - ABductor Pollicus Longus

Answer 3

Base of 1st metacarpal

Question 4

Nerve - ABductor Pollicus Longus

Answer 4

Radial C6, 7, 8

Question 5

Action - Extensor Pollicus Longus and Brevis

Answer 5

Extend the thumb

ABduct the wrist

Question 6

Origin - Extensor Pollicus Longus and Brevis

Answer 6

Longus: Posterior surface of ulna and interosseous membrane
Brevis: Posterior surface of radius and interosseous membrane

Question 7

Insertion - Extensor Pollicus Longus and Brevis

Answer 7

Longus: Base of distal phalanx of thumb
Brevis: Base of proximal phalanx of thumb

Question 8

Nerve - Extensor Pollicus Longus and Brevis

Answer 8

Radial - C6, 7, 8

Question 9

Action - Flexor Pollicus Longus

Answer 9

Flex the thumb

Question 10

Origin - Flexor Pollicus Longus

Answer 10

Anterior surface of radius and interosseous membrane

Question 11

Insertion - Flexor Pollicus Longus

Answer 11

Base of distal phalanx of thumb

Question 12

Nerve - Flexor Pollicus Longus

Answer 12

Median - C6, 7, 8, and T1

Question 13

Action - ABductor Pollicus Brevis

Answer 13

ABduct the thumb

Question 14

Origin - ABductor Pollicus Brevis

Answer 14

Flexor retinaculum, trapezium and scaphoid tubercles

Question 15

Insertion - ABductor Pollicus Brevis

Answer 15

Base of proximal phalanx of thumb

Question 16

Nerve - ABductor Pollicus Brevis

Answer 16

Median - C, 7, 8, T1

Question 17

Action - Flexor Pollicus Brevis

Answer 17

Flex the thumb

Question 18

Origin - Flexor Pollicus Brevis

Answer 18

Superficial head: Flexor retinaculum

Deep head: Trapezium, trapezoid and captitate

Question 19

Insertion - Flexor Pollicus Brevis

Answer 19

Base of proximal phalanx of thumb

Question 20

Nerve - Flexor Pollicus Brevis

Answer 20

Superficial head: Median

Deep head: Ulnar

Question 21

Action - Opponens Pollicus

Answer 21

Opposition of the thumb at the carpometacarpal joint (bringing thumb and pinky together)

Question 22

Origin - Opponens Pollicus

Answer 22

Flexor retinaculum and tubercle of the trapezium

Question 23

Insertion - Opponens Pollicus

Answer 23

Entire length of first metacarpal bone, radial surface

Question 24

Nerve - Opponens Pollicus

Answer 24

Median C6, 7, 8, T1

Question 25

Action - ADductor Pollicus

Answer 25

ADduct the thumb

Question 26

Origin - ADductor Pollicus

Answer 26

Capitate, second and third metacarpals

Question 27

Insertion - ADductor Pollicus

Answer 27

Base of proximal phalanx of thumb

Question 28

Nerve - ADductor Pollicus

Answer 28

Ulnar - C8, T1

Question 29

Action - Lumbricals of Hand

Answer 29

Extend the 2nd - 5th fingers at interphalangeal joints | Flex the 2nd - 5th fingers at the metacarpophalangeal joints

Question 30

Origin - Lumbricals of Hand

Answer 30

Surfaces of flexor digitorum profundus tendons

Question 31

Insertion - Lumbricals of Hand

Answer 31

Extensor aponeurosis on dorsal surface of phalanges

Question 32

Nerve - Lumbricals of Hand

Answer 32

2nd and 3rd fingers: Median | 4th and 5th fingers: Ulnar

Question 33

Action - Palmar Interossei

Answer 33

ADduct the thumb, 2nd, 4th and 5th towards the 3rd (middle) finger

Question 34

Origin - Palmar Interossei

Answer 34

Base of 1st, 2nd, 4th, 5th metacarpals

Question 35

Insertion - Palmar Interossei

Answer 35

Base of the proximal phalanx of the related finger and the extensor aponeurosis

Question 36

Nerve - Palmar Interossei

Answer 36

Ulnar

Question 37

Action - Dorsal Interossei

Answer 37

ABduct the 2nd, 3rd, 4th fingers

Question 38

Origin - Dorsal Interossei

Answer 38

Adjacent sides of all metacarpals

Question 39

Insertion - Dorsal Interossei

Answer 39

Base of the proximal phalanx of the 2nd, 3rd, 4th fingers and extensor aponeurosis

Question 40

Nerve - Dorsal Interossei

Answer 40

Ulnar

Question 41

Action - ABductor Digiti Minimi

Answer 41

ABduct the 5th finger

Question 42

Origin - ABductor Digiti Minimi

Answer 42

Pisiform and tendon carpi ulnaris

Question 43

Insertion - ABductor Digiti Minimi

Answer 43

Base of proximal phalanx of the 5th finger, ulnar surface

Question 44

Nerve - ABductor Digiti Minimi

Answer 44

Ulnar

Question 45

Action - Flexor Digiti Minimi

Answer 45

Flex the 5th finger

Question 46

Origin - Flexor Digiti Minimi

Answer 46

Hook of hamate and flexor retinaculum

Question 47

Insertion - Flexor Digiti Minimi

Answer 47

Base of proximal phalanx of 5th finger, palmar surface

Question 48

Nerve - Flexor Digiti Minimi

Answer 48

Ulnar

Question 49

Action - Opponens Digiti Minimi

Answer 49

Opposition of the 5th finger at the carpometacarpal joint

Question 50

Origin - Opponens Digiti Minimi

Answer 50

Hook of hamate and flexor retinaculum

Question 51

Insertion - Opponens Digiti Minimi

Answer 51

Shaft of 5th metacarpal, ulnar surface

Question 52

Nerve - Opponens Digiti Minimi

Answer 52

Ulnar

Question 53

Radial Collateral Ligament

Answer 53

a cordlike band that stretches from lateral epicondyle of humerus to the annular ligament and lateral side of the ulna. The ligament is deep to the supinator and extensors of the forearm

Question 54

Annular Ligament

Answer 54

wraps around the head and neck of the radius, stabilizing the proximal radius against the ulna during pronation and supination. It is deep to the the supinator and the extensor muscles of forearm

Question 55

Ulnar Collateral Ligament

Answer 55

a strong, triangular-shaped ligament that originates on the humerus' medial epicondyle. Its fibers spread out and attach to the coronoid process of ulna and to the olecranon process.

Question 56

Interosseous Membrane

Answer 56

Thin but strong fibrous sheet binds together the forearm bones and serves as an attachment site for several muscles

Question 57

Flexor retinaculum

Answer 57

located on palmar surface of the wrist. Its transverse fibers lie deep to palmaris longus tendon and superficial to other flexor tendons and median nerve. Stabilizes the wrist and thumb flexors

Question 58

Extensor retinaculum

Answer 58

located on posterior wrist. Stabilizes the wrist and thumb extensors