Week 8 - anterior arm muscles

Question 1

Anterior arm muscles (3)

Answer 1

Biceps brachii - long head
Biceps brachii - short head
Coracobrachialis
Brachialis

Question 2

BICEPS BRACHII

Answer 2

Attachments:

Proximal:
Long head: supraglenoid tubercle of
the scapula
Short head: coracoid process of
scapula
Distal: radial tuberosity

Action: forearm supination and elbow
flexion; shoulder flexion

NS: musculocutaneous n.

Question 3

CORACOBRACHIALIS

Answer 3

Attachments:

P: coracoid process of scapula
D: medial surface of humerus

Action: shoulder flexion and adduction

NS: musculocutaneous n.

Question 4

BRACHIALIS

Answer 4

Attachments:

P: anterior surface of distal humerus
D: coronoid process and ulnar
tuberosity

Action: elbow flexion

NS: musculocutaneous and radial n.

Question 5

Name all muscles that flex the humerus

Answer 5

Supraspinatus, deltoid anterior, biceps brachii, coracobrachialis

Question 6

Name all the muscles that medially rotate the humerus

Answer 6

Lats, pec major, subscapularis, teres major

Question 7

name all muscles that laterally rotate the humerus

Answer 7

Infraspinatus, teres minor

Question 8

William has indicated to you where his anterior shoulder pain is. You decide to test the muscles that may be implicated. You find that resisted supination of the elbow elicits his pain. What muscle is likely to be a source of pain?
1. Subscapularis
2. Biceps brachii
3. Coracobrachialis
4. Brachialis
5. Supinator (a muscle that is attached to the lower humerus
and the radius)

Answer 8

B