HAE Quiz 3: Muscles of the Arm

Question 1

Biceps Brachii

Answer 1

O: short head- coracoid process; long head- supraglenoid tubercle of scapula
I: radial tuberosity on radius, antebrachial fascia via bicipital aponeurosis
N: musculocutaneous nerve
F: supinates and flexes forearm (**strongest supinator)

Question 2

Coracobrachialis

Answer 2

O: coracoid proces
I: medial surface of humerus (midway)
N: musculocutaneous nerve
F: adducts and flexes arm

Question 3

Brachialis

Answer 3

O: anterior surface of the humerus (distal half)
I: ulnar tuberosity
N: musculocutanous nerve
F: flexes forearm

Question 4

Triceps Brachii

Answer 4

O: long head- infraglenoid tubercle of scapula; lateral head- posterior humerus superior to radial groove; medial head- posterior humerus inferior to radial groove
I: olecranon of ulna
N: radial nerve
F: extends forearm (long head can also extend arm)