Unit Four: The Wrist and Hand

Question 1

What innervates the brachioradialis and triceps brachii?

Answer 1

The radial nerve.

Question 2

What is the action of the pronator teres?

Answer 2

To pronate the forearm.

Question 3

What is the action of the palmaris longus?

Answer 3

Weak wrist flexor.

Question 4

What is the action of the flexor digitorum superficialis?

Answer 4

Flexes wrist at the PIP joints (and the 2nd to 5th MP joints).

Question 5

What is the MP joint?

Answer 5

The metacarpophalangeal (MP) joint

Question 6

What is the IP joint?

Answer 6

The interphalangeal joint.

Question 7

What is the action of the flexor pollicis longus?

Answer 7

To flex the MP and IP joint at the thumb

Question 8

What does pollicis/pollex mean?

Answer 8

Thumb.

Question 9

What is the action of the flexor digitorium profundus? (2)

Answer 9

1. Flexes the wrist. 2. Flexes the 2nd to 5th MP, IP, and DP joints.

Question 10

What innervates the medial portion of the flexor digitorium profundus?

Answer 10

The ulnar nerve.

Question 11

What innervates the lateral portion of the flexor digitorium profundus?

Answer 11

The median nerve.

Question 12

Where does the pronator teres originate and insert?

Answer 12

1. It originates on the medial epicondyle of the humerus. 2. It inserts on the lateral radius.

Question 13

What is the action of the pronator quadratus?

Answer 13

To pronate the forearm.

Question 14

What innervates the pronator quadratus?

Answer 14

The median nerve.

Question 15

What is the action of the extensor carpi radialis longus and extensor carpi radialis brevis? (2)

Answer 15

1. Extend the wrist. 2. Abducts the hand.

Question 16

What is the action of the extensor digitorum? (2)

Answer 16

1. Extends wrist. 2. Extends 2nd to 5th MP, PIP, and DP joints.

Question 17

What is the action of the extensor digiti minimi? (2)

Answer 17

1. Extends wrist. 2. Extends MP and PIP joints of finger 5.

Question 18

What is the action of the extensor carpi ulnaris? (2)

Answer 18

1. Extends wrist. 2. Adducts hands.

Question 19

What is the action of the abductor pollicis longus?

Answer 19

To abduct the thumb.

Question 20

What is the action of the extensor pollicis brevis?

Answer 20

Extends MP joints of thumb.

Question 21

What is the action of the extensor pollicis longus?

Answer 21

Extends the MP and IP joints of the thumb.

Question 22

What is the action of the extensor indicis?

Answer 22

Extends MP, PIP, and DIP joints of finger 2 (index).

Question 23

What is the action of the supinator?

Answer 23

To supinate the forearm.

Question 24

What is the action of the flexor pollicis brevis?

Answer 24

To flex the thumb.

Question 25

What is the action of the abductor pollicis brevis?

Answer 25

To abduct the thumb.

Question 26

What is the action of the opponens pollicis?

Answer 26

To oppose the thumb.

Question 27

What is the function of the flexor digiti minimi?

Answer 27

To flex finger 5.

Question 28

What is the function of the abductor digiti minimi?

Answer 28

To abduct finger 5.

Question 29

What is the action of the opponens digit minimi?

Answer 29

To oppose finger 5.

Question 30

What is the action of the lumbricals? (2)

Answer 30

1. Flexes 2nd-5th MP joints. 2. Extends 2nd-5th PIP and DIP joints.

Question 31

What is the action of the dorsal interossei?

Answer 31

To abduct finger 2-5.

Question 32

What is the action of the palmar interossei?

Answer 32

To adduct finger 2-5.

Question 33

What is the action of the adductor pollicis?

Answer 33

To adduct the thumb.

Question 34

The median nerve innervates all flexors but which two?

Answer 34

1. Flexor carpi ulnaris. 2. Medial portion of flexor digitorum profundus.

Question 35

What innervates the supinator?

Answer 35

The radial nerve.

Question 36

What innervates the abductor pollicis longus?

Answer 36

The radial nerve.

Question 37

What muscles comprise the thenar group of the intrinsic muscles of the hand? (3)

Answer 37

1. Flexor pollicis brevis. 2. Abductor pollicis brevis. 3. Opponens pollicis.

Question 38

What innervates the thenar group of intrinsic muscles of the hand?

Answer 38

The median nerve.

Question 39

What three muscles comprise the hypothenar group of intrinsic muscles of the hand?

Answer 39

1. Flexor digiti minimi. 2. Abductor digiti minimi. 3. Opponens digiti minimi.

Question 40

What innervates the hypothenar and midpalmar group of intrinsic muscles of the hand?

Answer 40

The ulnar nerve.

Question 41

What innervates the lateral and medial lumbricals?

Answer 41

Lateral 2: Ulnar. Medial 2: Ulnar nerve.

Question 42

Where does the flexor carpi radialis originate and insert?

Answer 42

1. Originates on the medial epicondyle. 2. Inserts on the base of the 2nd and 3rd metacarpals.

Question 43

Where does the flexor carpi ulnaris originate and insert?

Answer 43

1. Originates on the medial epicondyle. 2. Inserts on the medial carpal and and metacarpal bones.

Question 44

Where does the pronator quadratus originate and insert?

Answer 44

1. Originates on the distal ulna. 2. Inserts on the distal radius.

Question 45

What are the three primary elbow flexors?

Answer 45

1. Brachii. 2. Brachioradialis. 3. Brachialis.

Question 46

What are the two primary forearm pronators?

Answer 46

1. Pronator teres. 2. Pronator quadratus.

Question 47

What artery supplies blood to the anterior muscles of the forearm?

Answer 47

Ulnar artery.

Question 48

What artery supplies blood to the extensor digiti minimi and extensor digitorum?

Answer 48

The posterior interosseous artery.

Question 49

What artery supplies blood to the brachioradialis?

Answer 49

The radial (Recurrent) artery.

Question 50

What artery supplies blood to the extensor carpi radialis longus and brevis?

Answer 50

The radial artery.

Question 51

What artery supplies the supinator?

Answer 51

The radial (reccurent) artery.

Question 52

What artery supplies the extensor indicis, abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus?

Answer 52

The posterior interosseous artery.

Question 53

What artery supplies the flexor pollicis longus, pronator quadratus, and flexor digitorum profundus?

Answer 53

The anterior interosseous artery.

Question 54

What artery supplies the thenar group?

Answer 54

Superficial palmar arch.

Question 55

What artery supplies the hypothenar group?

Answer 55

Ulnar artery.

Question 56

What artery supplies the midpalmar group?

Answer 56

Superficial palmar arch.