Muscles Week 9 Lab

Question 1

Latissimus dorsi

Answer 1

A: adduction of arm
O: lower 3 to 4 ribs
I: spirals around teres major to insert in floor of intertubercular sulcus of humerus
Nerve Supply: thoracodorsal nerve (C6-C8)

Question 2

Trapezius

Answer 2

A: stabilizes scapula
O: occipital bone
I: acromion
Nerve Supply: accessory nerve (cranial nerve XI)

Question 3

Triceps brachii

Answer 3

A: powerful forearm extensor
O: posterior shaft of humerus
I: by common tendon into olecranon of ulna
Nerve Supply: radial nerve (C6-C8)

Question 4

Brachioradialis

Answer 4

A: synergist in forearm flexion
O: lateral supracondylar ridge at distal end of humerus
I: base of styloid process of radius
Nerve Supply: radial nerve (C5 and C6)

Question 5

Deltoid

Answer 5

A: prime mover of arm abduction when all its fibers contract simultaneously
O: acromion of scapula
I: deltoid tuberosity of humerus
Nerve Supply: axillary nerve (C5 and C6)

Question 6

Extensor carpi ulnaris

Answer 6

A: extends hand
O: lateral epicondyle of humerus
I: base of fifth metacarpal
Nerve Supply: radial nerve (C7)

Question 7

extensor digitroum communis

Answer 7

A: prime mover of finger extension
O: lateral epicondyle of humerus
I: by four tendons into distal phalanges of fingers II-V
Nerve Supply: radial nerve (C7)

Question 8

Extensor carpi radialis longus

Answer 8

A: extends hand
O: lateral supracondylar ridge of humerus
I: base of second metacarpal
Nerve Supply: radial nerve (C5 and C6)

Question 9

Flexor digitorum profundus

Answer 9

A: flexes distal interphalangeal joints
O: anteromedial surface of ulna
I: by four tendons into distal phalanges of fingers II-V
Nerve Supply:ulnar nerve (C7 and C8)

Question 10

Flexor carpi radialis

Answer 10

A: powerful flexor of hand
O: medial epicondyle of humerus
I: base of second and third metacarpals
Nerve Supply: median nerve (C6 and C7)

Question 11

Flexor carpi ulnaris

Answer 11

A: flexes hand
O: medial epicondyle of humerus
I: base of the fifth metacarpal
Nerve Supply: ulnar nerve (C8 and T1)

Question 12

Pronator teres

Answer 12

A: pronates forearm
O: medial epicondyle of humerus
I: by common tendon into lateral radius
Nerve Supply: median nerve (C6 and C7)

Question 13

Palmaris longus

Answer 13

A: tenses skin fascia of palm during hand movements
O: medial epicondyle of humerus
I: fascia of palm
Nerve Supply: median nerve (C7 and C8)