Muscles 2 (arm, back, and shoulder)

Question 1

Trapezius

Answer 1

A: Rotates scapula
O: Occipital bone
I: Spine of scapula
Nerve: CN XI Accessory nerve C3 and C4

Question 2

Latissimus dorsi

Answer 2

A: arm extension
O: lower 3 to 4 ribs or iliac crest
I: intertubercular sulcus of humerus
N: Thoracodorsal nerve C6-C8

Question 3

Triceps brachii

Answer 3

A: forearm extensor
O: posterior shaft of humerus
I: tendon into olecranon of ulna
N: radial nerve C6-C8

Question 4

Brachioradialis

Answer 4

A: synergist in forearm flexion
O: lateral supracondylar ridge at distal end of humerus
I: styloid process of radius
N: radial nerve C6-C8

Question 5

Deltoid

Answer 5

A: arm abduction
O: spine of scapula
I: deltoid tuberosity of humerus
N: axillary nerve C5 and C6

Question 6

Extensor carpi ulnaris

Answer 6

A: extends hand
O: lateral epicondyle of humerus
I: base of 5th metacarpal
N: radial nerve C7 and C8

Question 7

Extensor carpi ulnaris longus

Answer 7

A: extends hand
O: lateral supracondylar ridge of humerus
I: base of 2nd metacarpal
N: radial nerve C5 and C6

Question 8

Extensor digitorum

Answer 8

A: finger extension
O: lateral epicondyle of humerus
I: 4 tendons into extensor expansions
N: radial nerve C7 and C8

Question 9

Flexor digitorum profundus

Answer 9

A: flexes distal interphalangeal joints
O: interosseous membrane
I: 4 tendons into distal phalanges of fingers II-V
N: median nerve C7 and C8

Question 10

Flexor carpi radialis

Answer 10

A: flexes hand
O: medial epicondyle of humerus
I: based of 2nd and 3rd metacarpal
N: median nerve C6 and C7

Question 11

Flexor carpi ulnaris

Answer 11

A: flexes hand
O: medial epicondyle of humerus
I: pisiform and hamate bone
N: ulnar nerve C8 and T1

Question 12

Pronator teres

Answer 12

A: pronates arm
O: medial epicondyle of humerus
I: tendon inserts into lateral radius
N: median nerve C6 and C7

Question 13

Palmaris longus

Answer 13

A: tenses the skin
O: medial epicondyle of humerus
I: fascia of palm
N: median nerve C7 and C8