Forearm & Hand

Question 1

Brachialis

Answer 1

O: distal half of anterior surface of humerus

I: tuberosity and coronoid process of ulna

A: flex elbow in all forearm positions

N: musculocutaneous, small branch from radial C5, 6

Question 2

Brachioradialis

Answer 2

O: proximal two thirds of lateral supracondylar ridge of humerus

I: styloid process of radius

A: flex elbow in neutral forearm position, assists in pronation and supination

N: radial C5, 6

Question 3

Extensor Carpi Radialis Longus

Answer 3

O: distal third of lateral supracondylar ridge of humerus

I: base of second metacarpal

A: extend wrist, abduct wrist, assist flex elbow

N: radial C5, 6, 7, 8

Question 4

Extensor Carpi Radialis Brevis

Answer 4

O: common extensor tendon from lateral epicondyle of humerus

I: base of third metacarpal

A: extend wrist, abduct wrist, assist flex elbow

N: radial C6, 7, 8

Question 5

Extensor Carpi Ulnaris

Answer 5

O: common extensor tendon from lateral epicondyle of humerus

I: base of fifth metacarpal

N: radial C6, 7, 8

Question 6

Extensor Digitorum

Answer 6

O: common extensor tendon from lateral epicondyle of humerus

I: bases of middle and distal phalanges of second through fifth fingers

A: extend second through fifth fingers, assist extend wrist

N: radial C6, 7, 8

Question 7

Extensor Indicis

Answer 7

O: posterior surface of distal shaft of ulna and interosseous membrane

I: tendon of extensor digitorum at level of second metacarpal

A: extend pointer finger, adduct pointer finger, may assist extend wrist

N: radial C6, 7, 8

Question 8

Flexor Carpi Radialis

Answer 8

O: common flexor tendon from medial epicondyle of humerus

I: bases of second and third metacarpals

A: flex wrist, abduct wrist, may assist flex elbow

N: median C6, 7, 8

Question 9

Palmaris Longus

Answer 9

O: common flexor tendon from medial epicondyle of humerus

I: flexor retinaculum and palmar aponeurosis

A: tense palmar fascia, flex wrist, may assist flex elbow

N: median C(6), 7, 8, T1

Question 10

Flexor Carpi Ulnaris

Answer 10

O: humeral head: common flexor tendon from medial epicondyle of humerus
ulnar head: posterior surface of proximal two thirds of ulna

I: pisiform, hook of hamate, base of fifth metacarpal

A: flex wrist, adduct wrist, assist flex elbow

N: ulnar C7, 8, T1

Question 11

Flexor Digitorum Superficialis

Answer 11

O: common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane, proximal shaft of radius

I: sides of middle phalanges of second through fifth fingers

A: flex second through fifth fingers, flex wrist

N: median C7, 8, T1

Question 12

Flexor Digitorum Profundus

Answer 12

O: anterior and medial surface of proximal three quarters of ulna

I: bases of distal phalanges, palmar surface of second through fifth fingers

A: flex second through fifth fingers, assist flex wrist

N: second and third fingers: median C7, 8, T1
fourth and fifth fingers: ulnar C7, 8, T1

Question 13

Pronator Teres

Answer 13

O: common flexor tendon from medial epicondyle of humerus, coronoid process of ulna

I: middle of lateral surface of radius

A: pronate forearm, assist flex elbow

N: median C6, 7

Question 14

Pronator Quadratus

Answer 14

O: medial, anterior surface of distal ulna

I: lateral, anterior surface of distal radius

A: pronate forearm

N: median C7, 8, T1

Question 15

Supinator

Answer 15

O: lateral epicondyle of humerus, radial collateral ligament annular ligament, supinator crest of ulna

I: anterior, lateral surface of proximal third of radial shaft

N: radial C5, 6, (7)