Upper Arm Muscles OINA

Question 1

Biceps Brachii (Short Head)

Answer 1

O: tip of coracoid process of scapula
I: Tuberosity of Radius and Fascia of forearm via Bicipital aponeurosis
N: Musculocutaneous Nerve (C5, C6, C7)
A: Supinates forearm and, when it is supine, flexes the forearm; (SH only): resists dislocation of shoulder

Question 2

Biceps Brachii (Long Head)

Answer 2

O: Supraglenoid Tubercle of Scapula
I: Tuberosity of Radius and Fascia of forearm via Bicipital aponeurosis
N: Musculocutaneous Nerve (C5, C6, C7)
A: Supinates forearm and, when it is supine, flexes the forearm

Question 3

Coracobrachialis

Answer 3

O: Tip of Coracoid Process of Scapula
I: Middle third of Medial Surface of Humerus
N: Musculocutaneous Nerve (C5, C6, C7)
A: Helps flex and adduct arm; resists dislocation of the shoulder

Question 4

Brachialis

Answer 4

O: Distal Half of Anterior Surface of Humerus
I: Coronoid Process and Tuberosity Ulna
N: Musculocutaneous Nerve (C5, C6) and Radial Nerve (C5, C7)
A: Flexes forearm in all positions

Question 5

Triceps Brachii (Long Head)

Answer 5

O: Infraglenoid Tubercle of Scapula
I: Proximal end of Olecranon of Ulna and Fascia of Forearm
N: Radial Nerve (C6, C7, C8)
A: Extends forearm; resists dislocation of humerus

Question 6

Triceps Brachii (Lateral Head)

Answer 6

O: Posterior Surface of Humerus, Superior to Radial Groove
I: Proximal end of Olecranon of Ulna and Fascia of Forearm
N: Radial Nerve (C6, C7, C8)
A: Extends forearm

Question 7

Triceps Brachii (Medial Head)

Answer 7

O: Posterior Surface of Humerus, Inferior to Radial Groove
I: Proximal end of Olecranon of Ulna and Fascia of Forearm
N: Radial Nerve (C6, C7, C8)
A: Extends forearm