Arm Muscles

Question 1

Biceps Brachii- short head

Answer 1

PA: coracoid process of scapula

DA: radial tuberosity and fascia of forearm via bicipital aponeurosis (lacertus fibrosus)

A: supinates and flexes forearm

N: musculocutaneous nerve c5-7

Question 2

Biceps Brachii- long head

Answer 2

PA: supraglenoid tubercle

DA: radial tuberosity and fascia of forearm via bicipital aponeurosis (lacertus fibrosus)

A: supinates and flexes forearm, flexes arm
prevents anterior and inferior translation of humeral head

N: musculocutaneous nerve c5-7

Question 3

Brachialis

Answer 3

PA: anterior lower surface of humerus

DA: coronoid process and ulnar tuberosity

A: flex forearm

N: musculocutaneous c5-6

Question 4

Coracobrachialis

Answer 4

PA: coracoid process

DA: medial 1/3 surface of humerus

A: flex and ADD humerus

N: musculocutaneous c5-7 (pierces muscle)

Question 5

Triceps Brachii- long head

Answer 5

PA: infraglenoid tubercle on scapula

DA: olecranon process

N: radial nerve c6-8

A: extend elbow, extend shoulder

Question 6

Triceps Brachii- medial head

Answer 6

PA: posterior surface of humerus, inferior and medial to radial groove

DA: olecranon process

A: extend elbow

N: radial nerve c6-8

Question 7

Triceps Brachii

Answer 7

PA: posterior surface of humerus, superior and lateral to radial groove

DA: olecranon process

A: extend elbow

N: radial nerve c6-8

Question 8

Anconeus

Answer 8

PA: lateral epicondyle of humerus

DA: superior part of posterior surface of ulna and little olecranon

A: terminal elbow extension, stabilizes elbow joint, abducts ulna during pronation

N: radial nerve c7-t1