15. Dissection of the Posterior Forearm and Dorsum of the Hand

Question 1

What is the action of flexor carpi ulnaris?

Answer 1

Flexes & adducts the wrist joint

Question 2

What is the action of palmaris longus?

Answer 2

Flexes wrist joint, resists shearing forces when gripping

Question 3

What is the action of flexor carpi radialis?

Answer 3

Flexes & abducts the wrist

Question 4

What is the action of pronator teres?

Answer 4

Pronation

Question 5

What is the action of flexor digitorum superficialis?

Answer 5

Flexes PIPJs of 4 fingers, can also flex MCP joints of 4 fingers & flex wrist

Question 6

What is the action of flexor digitorum profundus?

Answer 6

Flexes DIP joints of 4 fingers, flexes MCP of 4 fingers & flexes wrist

Question 7

What is the action of flexor pollicis longus?

Answer 7

Flexes interphalangeal joint of the thumb
Flexes MCP joint of thumb

Question 8

What is the action of pronator quadratus?

Answer 8

Pronation

Question 9

What is the action of brachioradialis?

Answer 9

Accessory flexor of elbow when forearm is mid-pronated.

Question 10

What is the action of extensor carpi radialis longus?

Answer 10

Extends and abducts the wrist

Question 11

What is the action of extensor carpi radialis brevis?

Answer 11

Extends and abducts the wrist

Question 12

What is the action of extensor digitorum?

Answer 12

Extends 4 fingers & wrist

Question 13

What is the function of extensor digiti minimi?

Answer 13

Extends the little finger

Question 14

What is the function of extensor carpi ulnaris?

Answer 14

Extends and adducts the wrist

Question 15

What is the function of the anconeus?

Answer 15

Abduction of the ulna in pronation
Accessory extensor of the elbow joint

Question 16

What is the function of supinator?

Answer 16

Supination

Question 17

What is the function of abductor pollicis longus?

Answer 17

Abducts carpometacarpal joint of thumb
Accessory extensor of the thumb

Question 18

What is the function of extensor pollicis brevis?

Answer 18

Extends the MCP joint of the thumb
Can extend the carpometacarpal joint of the thumb

Question 19

What is action of extensor pollicis longus?

Answer 19

Extends the interphalangeal joint of the thumb
Can also extend carpometacarpal and metacarpophalangeal joints of the thumb

Question 20

What is the action of extensor indicis?

Answer 20

Extends the index finger

Question 21

What is the innervation of flexor carpi ulnaris?

Answer 21

Ulnar nerve

Question 22

What is the innervation of palmaris longus?

Answer 22

Median nerve

Question 23

What is the innervation of flexor carpi radialis?

Answer 23

Median nerve

Question 24

What is the innervation of pronator teres?

Answer 24

Median nerve

Question 25

What is the innervation of flexor digitorum superficialis?

Answer 25

Median nerve

Question 26

What is the innervation of flexor digitorum profundus?

Answer 26

Lateral half = median nerve Medial half = ulnar nerve

Question 27

What is the innervation of flexor pollicis longus?

Answer 27

Median nerve

Question 28

What is the innervation of pronator quadratus?

Answer 28

Median nerve

Question 29

What is the innervation of brachioradialis?

Answer 29

Radial nerve (before division)

Question 30

What is the innervation of extensor carpi radialis longus?

Answer 30

Radial nerve

Question 31

What is the innervation of extensor carpi radialis brevis?

Answer 31

Deep branch of radial nerve

Question 32

What is the innervation of extensor digitorum?

Answer 32

Posterior interosseous nerve

Question 33

What is the innervation of extensor digiti minimi?

Answer 33

Posterior interossoeous nerve

Question 34

What is the innervation of extensor carpi ulnaris?

Answer 34

Posterior interossoeous nerve

Question 35

What is the innervation of anconeus?

Answer 35

Radial nerve

Question 36

What is the innervation of supinator?

Answer 36

Posterior interosseous nerve

Question 37

What is the innervation of abductor pollicis longus?

Answer 37

Posterior interosseous nerve

Question 38

What is the innervation of extensor pollicis brevis?

Answer 38

Posterior interosseous nerve

Question 39

What is the innervation of extensor pollicis longus?

Answer 39

Posterior interosseous nerve

Question 40

What is the innervation of extensor indicis?

Answer 40

Posterior interosseous nerve

Question 41

Which muscle in the posterior compartment of the forearm is innervated by the radial nerve but acts to flex the forearm at the elbow joint in the mid-prone position?

Answer 41

Brachioradialis

Question 42

The deep branch of the radial nerve becomes the posterior interosseous nerve after it has pierced through which muscle?

Answer 42

Supinator

Question 43

Which vein arises from the medial aspect of the dorsal venous arch?

Answer 43

Basilic

Question 44

Which muscle tendon forms the medial boundary of the anatomical snuffbox?

Answer 44

Extensor pollicis longus

Question 45

Which two carpal bones from the floor of the anatomical snuffbox?

Answer 45

Trapezium and scaphoid

Question 46

The extensor carpi ulnaris acts to extend the hand at the wrist joint but also medially deviate (adduct) the hand at the wrist joint. True or False?

Answer 46

True

Question 47

The superficial branch of the radial nerve descends to provide sensory innervation to the dorm of the hand and the lateral (radial) 3.5 digits?

Answer 47

True

Question 48

The radial artery travels over the floor of the anatomical snuffbox with the deep branch of the radial nerve and the cephalic vein. True or False?

Answer 48

False

Question 49

The dorsal interossei muscles act to adduct the digits at the MCP joints. True or False?

Answer 49

False

Question 50

The anconeus muscle acts to extend the forearm at the elbow joint. True or False?

Answer 50

True