15. Muscles of Forearm

Question 1

Identify

Answer 1

1. Pronator teres muscle
2. Pronator quadratus muscle

Question 2

Identify 2. O & I

Answer 2

2. Pronator quadratus muscle

Origin (proximal): arises from the medial aspect of the anterior surface of the distal one-fourth of the ulna.

Insertion (distal): The distal fourth of the lateral border and anterior surface of the shaft of the radius.

Question 3

Identify 1. O & I

Answer 3

1. Pronator teres muscle

Origin (proximal): The pronator teres has 2 heads.

• The humeral head arises immediately above the medial epicondyle from the common flexor tendon, intermuscular septum, and antebrachial fascia.
• The ulnar head arises from the medial side of the coronoid process of the ulna.

Insertion (distal): The pronator teres inserts about midway along the lateral surface of the radius.

Question 4

Identify 1. Action

Answer 4

1. Pronator teres muscle

Action: The pronator teres rotates the radius on the ulna (pronation) and helps flex the forearm at the elbow.

Question 5

Identify 1. Innervation

Answer 5

1. Pronator teres muscle

→ the median nerve (pronator teres—C6 and C7)

Question 6

Identify 2. O & I

Answer 6

2. Pronator quadratus muscle

Origin (proximal): arises from the medial aspect of the anterior surface of the distal one-fourth of the ulna.

Insertion (distal): The distal fourth of the lateral border and anterior surface of the shaft of the radius.

Question 7

Identify 2. Action

Answer 7

2. Pronator quadratus muscle

The pronator quadratus pronates the hand.

→ It is assisted by the pronator teres when additional power is required.

Question 8

Identify 2. Innervation

Answer 8

2. Pronator quadratus muscle

→ the median nerve (pronator teres—C6 and C7; pronator quadratus—C8 and T1).

Question 9

Origin (proximal): The pronator teres has 2 heads.

1. The humeral head arises immediately above ____ from the common flexor tendon, intermuscular septum, and antebrachial fascia.
2. The ulnar head arises from the medial side of ____

Answer 9

1. the medial epicondyle
2. the coronoid process of the ulna.

Question 10

Which muscle is the deepest muscle of forearm?

Answer 10

The pronator quadratus

Question 11

Origin (proximal): The pronator teres has 2 heads.

1. The humeral head arises immediately above ____ from the common flexor tendon, intermuscular septum, and antebrachial fascia.
2. The ulnar head arises from the medial side of ____

Answer 11

1. the medial epicondyle
2. the coronoid process of the ulna.

Question 12

Identify

Answer 12

1. Flexor carpi radialis muscle
2. Head of radius
3. Lateral epicondyle of humerus
4. Tendon of flexor carpi ulnaris muscle

Question 13

The role of The radial extensors?

Answer 13

The radial extensors help the flexor carpi radialis abduct the wrist.

Question 14

Identify 1. O & I

Answer 14

1. Flexor carpi radialis muscle
2. Head of radius
3. Lateral epicondyle of humerus
4. Tendon of flexor carpi ulnaris muscle

Question 15

Identify 1. Action

Answer 15

1. Flexor carpi radialis muscle

Action: Flexes the hand at the wrist joint and aids in wrist abduction.

Question 16

Identify 1. Innervation

Answer 16

1. Flexor carpi radialis muscle

Innervation: Median nerve (C6 and C7).

Question 17

Identify 1 - 2

Answer 17

1. Palmaris longus muscle
2. Radius

Question 18

Identify 1. Action

Answer 18

1. Palmaris longus muscle

Action: Flexes the hand at the wrist and tightens the palmar aponeurosis.

Question 19

Identify 3 - 5

Answer 19

3. Palmar aponeurosis (cut)
4. Hook of hamate
5. Pisiform bone

Question 20

Identify 6

Answer 20

6. Ulna

Question 21

Identify 1. O & I

Answer 21

1. Palmaris longus muscle

Origin (proximal): arises from the medial epicondyle of the humerus by the common flexor tendon and the antebrachial (forearm) fascia.

Insertion (distal): Inserts into the anterior aspect of the distal flexor retinaculum and into the palmar aponeurosis.

Question 22

Identify 1. Innervation

Answer 22

1. Palmaris longus muscle

Median nerve (C6 and C7).

Question 23

____ (which nerve?) lies just lateral to the tendon of the palmaris longus muscle before entering the carpal tunnel.

Answer 23

The median nerve

Question 24

The median nerve lies just lateral to the tendon of ____ (which muscle?) before entering the carpal tunnel.

Answer 24

Palmaris longus muscle

Question 25

The **median nerve** lies just lateral to the tendon of the palmaris longus muscle before entering ____ (space?)

Answer 25

the carpal tunnel

Question 26

Identify

Answer 26

1. **Flexor carpi ulnaris muscle** 2. Tendon of flexor carpi radialis muscle 3. Medial epicondyle of humerus 4. Common flexor tendon 5. 5th metacarpa

Question 27

Identify 1. O & I

Answer 27

1. **Flexor carpi ulnaris muscle** 2. Tendon of flexor carpi radialis muscle 3. Medial epicondyle of humerus 4. Common flexor tendon 5. 5th metacarpa

Question 28

The role of The ulnar extensor?

Answer 28

The ulnar extensor helps the flexor carpi ulnaris adduct the hand at the wrist.

Question 29

Identify 1. **Action**

Answer 29

1. **Flexor carpi ulnaris muscle** **Action:** Flexes and adducts the hand at the wrist.

Question 30

Identify 1. **Innervation**

Answer 30

1. **Flexor carpi ulnaris muscle** **Innervation:** Ulnar nerve (C7 and C8).

Question 31

\_\_\_ (nerve?) runs between the heads of **Flexor carpi ulnaris muscle** as it courses toward the wrist. The 2 heads of **Flexor carpi ulnaris muscle** join just below \_\_\_

Answer 31

the ulnar nerve

Question 32

**Origin (proximal): Flexor carpi ulnaris muscle** has 2 heads. * The humeral head arises from ___ by the common flexor tendon. * The ulnar head arises from ____ and \_\_\_\_

Answer 32

* the medial epicondyle of the humerus * the medial margin of the olecranon; posterior border of the ulna.

Question 33

Identify

Answer 33

**Flexor digitorum superficialis muscle** Flexor pollicis longus muscle Flexor digitorum profundus tendons

Question 34

Identify 1. O & I

Answer 34

1. **Flexor digitorum superficialis muscle** **Origin (proximal): Flexor digitorum superficialis muscle** arises by 2 heads * The humeroulnar head arises from the medial epicondyle of the humerus, the ulnar collateral ligament, and the coronoid process of the ulna. * The radial head arises from the superior half of the anterior aspect of the radius. **Insertion (distal):** Four tendons of insertion of the flexor digitorum superficialis attach to the bodies of the middle phalanges of the medial 4 digits (index finger to little finger).

Question 35

Identify 1. **Action**

Answer 35

1. **Flexor digitorum superficialis muscle** **Action:** * This muscle acts primarily as a flexor of the proximal interphalangeal joints. * contributes to flexion of all the joints it crosses, including the elbow, wrist, and metacarpophalangeal joints.

Question 36

Identify 1. **Innervation**

Answer 36

**Flexor digitorum superficialis muscle** **Innervation:** Median nerve (C7, C8, and T1).

Question 37

**Comment:** Opposite the bases of the 1st phalanges, each tendon of **Flexor digitorum superficialis muscle** divides to allow the corresponding tendon of the deep flexor (\_\_\_ muscle) to reach each finger.

Answer 37

**Flexor digitorum superficialis muscle** Flexor pollicis longus muscle Flexor digitorum profundus tendons

Question 38

Identify

Answer 38

1. **Flexor digitorum profundus muscle** 2. Flexor digitorum superficialis tendons (cut away) 3. Flexor digitorum profundus tendons

Question 39

Identify 1. O & I

Answer 39

1. **Flexor digitorum profundus muscle** **Origin (proximal):** arises from the proximal three-fourths of the medial and anterior aspects of the ulna and from the interosseous membrane. **Insertion (distal):** Four tendons of the flexor digitorum profundus attach to the bases of the distal phalanges of the medial 4 digits (index finger to little finger).

Question 40

Identify 1. Action

Answer 40

1. **Flexor digitorum profundus muscle** **Action:** * The primary action of the flexor digitorum profundus muscle is flexion of the distal interphalangeal joints. * Some flexion at the proximal interphalangeal joints, the metacarpophalangeal joints, and the wrist *(because its tendons cross those joints.)*

Question 41

**Flexor digitorum profundus muscle** also produces some flexion at the proximal interphalangeal joints, the metacarpophalangeal joints, and the wrist → WHY?

Answer 41

because its tendons cross those joints.

Question 42

Identify 1. **Innervation**

Answer 42

1. **Flexor digitorum profundus muscle** **Innervation:** Proximal to the wrist, the flexor digitorum profundus muscle divides into 2 parts. * The medial part is innervated by the **ulnar nerve** (C8 and T1). * The lateral portion of the muscle is innervated by the anterior interosseous branch of the **median nerve** (C8 and T1).

Question 43

**Flexor digitorum profundus muscle** **Innervation:** Proximal to the wrist, the flexor digitorum profundus muscle divides into 2 parts. 1. The medial part is innervated by the \_\_\_\_. 2. The lateral portion of the muscle is innervated by \_\_\_

Answer 43

1. **ulnar nerve** (C8 and T1) 2. the anterior interosseous branch of the **median nerve** (C8 and T1).

Question 44

Identify

Answer 44

**Flexor pollicis longus muscle** Interosseous membrane Flexor digitorum profundus muscle

Question 45

Identify 1. O & I

Answer 45

1. **Flexor pollicis longus muscle** **Origin (proximal): Flexor pollicis longus muscle** arises from anterior aspect of the radius and adjacent interosseous membrane. **Insertion (distal):** Flexor pollicis longus muscle inserts on the base of the distal phalanx of the thumb.

Question 46

Identify 1. **Action**

Answer 46

1. **Flexor pollicis longus muscle** **Action:** * The primary action of the flexor pollicis longus muscle is flexion of the distal phalanx of the thumb. * The muscle also can flex the proximal phalanx because its tendon crosses that joint.

Question 47

Identify 1. **Innervation**

Answer 47

1. **Flexor pollicis longus muscle** **Innervation:** Median nerve (anterior interosseous branch) (C7, C8, and T1).

Question 48

Identify

Answer 48

1. **Supinator muscle** 2. Pronator teres muscle 3. Ulna 4. Pronator quadratus muscle 5. Radius 6. Lateral epicondyle of humerus

Question 49

Identify 1. O & I

Answer 49

1. **Supinator muscle** **Origin (proximal): Supinator muscle** arises from the lateral epicondyle of the humerus **Insertion (distal):** Inserts into the lateral, posterior, and anterior surfaces of the proximal third of the radius.

Question 50

Identify 1. **Action**

Answer 50

1. **Supinator muscle** **Action:** The supinator rotates the radius to supinate the forearm and hand. Supination occurs whether the forearm is flexed or extended.

Question 51

Identify 1. **Innervation**

Answer 51

1. **Supinator muscle** **Innervation:** Deep branch of the radial nerve (C5 and C6).

Question 52

The most powerful supinator of the forearm is (1)\_\_\_\_\_ which acts primarily when the forearm is flexed. In contrast, the (2)\_\_\_ can supinate a forearm that is flexed or extended.

Answer 52

1. the biceps brachii 2. supinator

Question 53

\_\_\_\_ (ARTERY?) passes through the supinator, serving as its major blood supply.

Answer 53

The posterior interosseous artery

Question 54

Identify 1. O & I

Answer 54

**1. Brachioradialis muscle** **Origin (proximal):** the lateral supracondylar ridge of the distal humerus and intermuscular septum. **Insertion (distal):** lateral aspect of the distal radius just proximal to the styloid process.

Question 55

Identify 1. Action?

Answer 55

**1. Brachioradialis muscle** **Action:** Brachioradialis muscle is an accessory flexor of the forearm at the elbow.

Question 56

Identify 1. **Innervation**?

Answer 56

**1. Brachioradialis muscle** **Innervation:** Radial nerve (C5 and C6), before it divides into its superficial and deep branches.

Question 57

Is the brachioradialis extensor or supinator?

Answer 57

It is not an extensor or supinator. → It is a weak flexor of the forearm at the elbow and is most efficient as a flexor when the forearm is in midpronation.

Question 58

Identify 2 - 3

Answer 58

2. Radial artery 3. Median nerve

Question 59

Identify 4 - 5

Answer 59

4. Ulnar artery 5. Ulnar nerve

Question 60

Identify 6

Answer 60

Palmaris longus muscle

Question 61

Identify 7

Answer 61

7. Flexor digitorum superficialis muscle

Question 62

Identify 8 - 9

Answer 62

8. Flexor carpi radialis muscle 9. Pronator teres muscle

Question 63

Identify 1. O & I

Answer 63

1. **Extensor carpi radialis longus muscle** **Origin (proximal): Extensor carpi radialis longus muscl**e arises from lateral supracondylar ridge of the humerus. **Insertion (distal):** Attaches to the base of the 2nd metacarpal.

Question 64

Identify 1. **Action**

Answer 64

1. **Extensor carpi radialis longus muscle** **Action:** Extends and abducts the hand at the wrist joint.

Question 65

Identify 1. **Innervation**

Answer 65

1. **Extensor carpi radialis longus muscle** **Innervation:** Radial nerve (C6 and C7).

Question 66

The extensor carpi radialis longus muscle arises just distal to (1)\_\_\_\_ (muscle?) Its belly ends in the proximal third of the forearm. Its flat tendon continues distally along the lateral border of the radius beneath (2) ____ (2 muscles?)

Answer 66

1. **the brachioradialis muscle.** 2. the abductor pollicis longus and extensor pollicis brevis muscles.

Question 67

Identify 2 - 3

Answer 67

2. Tendon of extensor carpi radialis longus muscle 3. Tendon of extensor carpi radialis brevis muscle

Question 68

Identify 4 - 5

Answer 68

4. Abductor pollicis longus muscle 5. Extensor pollicis brevis muscle

Question 69

Identify 1. O & I

Answer 69

1. **Extensor carpi radialis brevis muscle** **Origin (proximal): Extensor carpi radialis brevis muscle** arises from lateral epicondyle of the humerus. **Insertion (distal):** Extensor carpi radialis brevis muscle inserts on the base of the 3rd metacarpal bone.

Question 70

Identify 1. **Innervation**

Answer 70

1. **Extensor carpi radialis brevis muscle** **Innervation:** Radial nerve (deep branch) (C7 and C8).

Question 71

The extensor carpi radialis brevis muscle is shorter and thicker than (1)\_\_\_ (MUSCLE?), which partially covers it. Occasionally, both muscles form a single belly that gives rise to 2 tendons. This muscle is important for a power grip (a **power grip** requires wrist extension).

Answer 71

**the extensor carpi radialis longus**

Question 72

Which movement of wrist that is required for a power grip?

Answer 72

wrist extension

Question 73

Identify 1. **Action**

Answer 73

1. **Extensor carpi radialis brevis muscle** **Action:** Extends and abducts the hand at the wrist joint.

Question 74

Identify 1

Answer 74

1. **Extensor digitorum muscle** **Origin (proximal): Extensor digitorum muscle arises** from lateral epicondyle of the humerus. **Insertion (distal):** Extensor digitorum muscles insert as extensor expansions of the medial 4 digits (index finger to little finger).

Question 75

Identify 1. O & I

Answer 75

1. **Extensor digitorum muscle** **Origin (proximal): Extensor digitorum muscle arises** from lateral epicondyle of the humerus. **Insertion (distal):** Extensor digitorum muscles insert as extensor expansions of the medial 4 digits (index finger to little finger).

Question 76

Identify 1

Answer 76

1. **Extensor digitorum muscle** **Action:** * extension at the metacarpophalangeal and interphalangeal joints. * also participates in wrist extension when the fingers are extended.

Question 77

Identify 1. Nerve?

Answer 77

1. **Extensor digitorum muscle** **Innervation:** Radial nerve (posterior interosseous branch) (C7 and C8).

Question 78

The tendons of the extensor digitorum pass through (1)\_\_\_ and to the extensor expansions of the medial 4 digits. Occasionally, this muscle has only 3 tendons instead of 4. Often, (2)\_\_\_ is attached to the extensor digitorum.

Answer 78

1. the extensor retinaculum 2. the extensor digiti minimi

Question 79

Identify 2 - 4

Answer 79

2. Abductor pollicis longus muscle 3. Extensor pollicis brevis muscle 4. Extensor pollicis longus tendon

Question 80

Identify 1. O & I

Answer 80

1. **Extensor digiti minimi muscle** **Origin (proximal): Extensor digiti minimi muscle** arises from lateral epicondyle of the humerus. **Insertion (distal):** Extensor digiti minimi muscle inserts as an extensor expansion of the 5th digit.

Question 81

Identify 1. Action

Answer 81

1. **Extensor digiti minimi muscle** **Action:** * Extends the 5th digit at the metacarpophalangeal and interphalangeal joints. * also participates in wrist extension when the fingers are extended.

Question 82

Identify 2- 4

Answer 82

2. Common extensor tendon 3. Lateral epicondyle of humerus 4. Ulna

Question 83

Identify 5 - 6

Answer 83

5. Extensor digiti minimi tendon 6. Extensor indicis tendon

Question 84

Identify 1

Answer 84

1. **Extensor carpi ulnaris muscle** **Origin (proximal): Extensor carpi ulnaris muscle** has 2 heads. One head arises from the lateral epicondyle of the humerus, and the other arises from the posterior border of the ulna. **Insertion (distal):** Attaches to the medial side of the base of the 5th metacarpal.

Question 85

Identify 2 - 4

Answer 85

2. Abductor pollicis longus tendon 3. Extensor pollicis brevis tendon 4. Extensor pollicis longus tendon

Question 86

Identify 1. O & I

Answer 86

1. **Extensor carpi ulnaris muscle** **Origin (proximal): Extensor carpi ulnaris muscle** has 2 heads. One head arises from the lateral epicondyle of the humerus, and the other arises from the posterior border of the ulna. **Insertion (distal):** Attaches to the medial side of the base of the 5th metacarpal.

Question 87

Identify 1. **Action**

Answer 87

1. **Extensor carpi ulnaris muscle** **Action:** Extends and adducts the hand at the wrist joint.

Question 88

Identify 1. **Innervation**

Answer 88

1. **Extensor carpi ulnaris muscle** **Innervation:** Radial nerve (posterior interosseous branch (C7 and C8).

Question 89

1. **Extensor carpi ulnaris muscle** **Origin (proximal): Extensor carpi ulnaris muscle** has 2 heads. * One head arises from \_\_\_\_, and the other arises from \_\_\_

Answer 89

* The lateral epicondyle of the humerus * the posterior border of the ulna.

Question 90

3 muscles necessary for a power grip

Answer 90

* the extensor carpi radialis longus and brevis muscles * the extensor carpi ulnaris

Question 91

Identify 1 - 2

Answer 91

1. **Abductor pollicis longus muscle** 2. Extensor pollicis brevis muscle

Question 92

Identify 1. O & I

Answer 92

1. **Abductor pollicis longus muscle** **Origin (proximal): Abductor pollicis longus muscle** arises from posterior aspect of the ulna, radius, and interosseous membrane. **Insertion (distal):** Attaches to the base of the 1st metacarpal bone.

Question 93

Identify 1. Action?

Answer 93

1. **Abductor pollicis longus muscle** **Action:** * Abducts, extends, and laterally rotates the thumb at the carpometacarpal joint. * It also may contribute to abduction of the wrist.

Question 94

Identify 1. **Innervation**

Answer 94

1. **Abductor pollicis longus muscle** **Innervation:** Radial nerve (posterior interosseous branch) (C7 and C8).

Question 95

Identify 1 - 2

Answer 95

1. **Abductor pollicis longus muscle** 2. Extensor pollicis brevis muscle

Question 96

Identify 3 - 4

Answer 96

3. Extensor pollicis longus tendon 4. 1st dorsal interosseous muscle

Question 97

Identify 5 - 7

Answer 97

5. Extensor indicis tendon 6. Extensor digitorum tendons 7. Abductor digiti minimi muscle

Question 98

Identify 8 - 9

Answer 98

8. Extensor digiti minimi muscle 9. Extensor carpi ulnaris muscle

Question 99

When the thumb is abducted, the tendon of (1)\_\_\_\_ **(muscle?)** becomes prominent and forms the lateral boundary of the (2)\_\_\_\_ ***(space?)***

Answer 99

1. the abductor pollicis longus 2. **“anatomical snuffbox.”**

Question 100

Identify 1 - 2

Answer 100

1. **Extensor pollicis brevis muscle** 2. Abductor pollicis longus muscle

Question 101

Identify 1. O & I

Answer 101

1. **Extensor pollicis brevis muscle** **Origin (proximal): Extensor pollicis brevis muscle** arises from the posterior surface of the radius and the interosseous membrane. **Insertion (distal):** Attaches to the base of the proximal phalanx of the thumb.

Question 102

Identify 1. **Action**

Answer 102

1. **Extensor pollicis brevis muscle** **Action:** * Extends the proximal phalanx of the thumb at the metacarpophalangeal joint. * By its continued action, it also can extend the 1st metacarpal bone at the carpometacarpal joint.

Question 103

Identify 1. **Innervation**

Answer 103

1. **Extensor pollicis brevis muscle** **Innervation:** Radial nerve (posterior interosseous branch) (C7 and C8).

Question 104

The extensor pollicis brevis muscle, a short extensor of the thumb, courses with (1)\_\_\_\_ (muscle?). → The tendons of the 2 muscles form part of the lateral boundary of (2)\_\_\_\_ (space?)

Answer 104

1. the abductor pollicis longus muscle 2. the **“anatomical snuffbox.”**

Question 105

Identify 3 - 4

Answer 105

3. Radius 4. Supinator muscle

Question 106

Identify 5 - 6

Answer 106

5. Anconeus muscle 6. Ulna

Question 107

Identify 7

Answer 107

7. Extensor indicis muscle

Question 108

Identify 8 - 9

Answer 108

8. Extensor retinaculum 9. Radial artery (in anatomical snuff box)

Question 109

Identify 1 - 2

Answer 109

1. **Extensor pollicis longus muscle** 2. Extensor carpi ulnaris muscle (retracted)

Question 110

Identify 1. O & I

Answer 110

1. **Extensor pollicis longus muscle** **Origin (proximal): Extensor pollicis longus muscle** arises from posterior surface of the middle third of the ulna and the interosseous membrane. **Insertion (distal):** Attaches to the base of the distal phalanx of the thumb.

Question 111

Identify 1. **Action**

Answer 111

1. **Extensor pollicis longus muscle** **Action:** * Extends the distal phalanx of the thumb at the metacarpophalangeal and interphalangeal joints. * contribute to abduction of the thumb. *(Because it runs in an oblique fashion)*

Question 112

Identify 1. **Innervation**

Answer 112

1. **Extensor pollicis longus muscle** **Innervation:** Radial nerve (posterior interosseous branch) (C7 and C8).

Question 113

Which artery can be found at the **“anatomical snuffbox?"**

Answer 113

The radial artery

Question 114

Which bone lies in the floor of the snuffbox?

Answer 114

1. **scaphoid and trapezium carpal bone**

Question 115

Identify 3 - 5

Answer 115

3. Lateral epicondyle of humerus 4. Extensor carpi radialis longus muscle 5. Extensor carpi radialis brevis muscle

Question 116

Identify 6

Answer 116

6. Interosseous membrane

Question 117

The anatomical snuffbox is bounded * laterally by \_\_\_ * medially by \_\_\_\_. * ____ lies in the floor of the snuffbox

Answer 117

* the tendons of the abductor pollicis longus and extensor pollicis brevis muscles * the extensor pollicis longus tendon * The scaphoid carpal bone

Question 118

Identify 1. **Action**

Answer 118

1. **Extensor indicis muscle** **Action:** Extends all the joints of the index finger. It can help other extensors extend the wrist.

Question 119

Identify 1. **Innervation**

Answer 119

1. **Extensor indicis muscle** **Innervation:** Radial nerve (posterior interosseous branch) (C7 and C8).

Question 120

The extensor indicis muscle, a narrow, elongated muscle, lies medial and parallel to ___ (MUSCLE?). It permits the index finger to extend independently of the other fingers.

Answer 120

the extensor pollicis longus muscle

Question 121

Identify 1 - 2

Answer 121

1. Pronator teres muscle 2. Supinator muscle

Question 122

Identify 3 - 5

Answer 122

3. Flexor carpi radialis muscle 4. Flexor pollicis longus muscle 5. Extensor digitorum muscle

Question 123

Identify 6

Answer 123

6. Pronator quadratus muscle

Question 124

Identify 7 - 9

Answer 124

7. Flexor digitorum profundus muscle 8. Flexor carpi ulnaris muscle 9. Flexor digitorum superficialis muscle

Question 125

Muscles of the anterior, or flexor, compartment of the forearm are innervated largely by \_\_\_\_ Only the flexor carpi ulnaris and the medial half of the flexor digitorum profundus are innervated \_\_\_\_

Answer 125

* the median nerve and its branches. * by the ulnar nerve and its branches.

Question 126

Muscles of the posterior compartment of the forearm are innervated by \_\_\_

Answer 126

the radial nerve and its branches.