Muscles of Upper Arm

Question 1

Innervation of all anterior upper arm muscles

Answer 1

Musculocutaneous nerve

Question 2

Innervation of triceps brachii

Answer 2

Radial nerve

Question 3

Attachments of coracobrachialis

Answer 3

Originates from the coracoid process of the scapula. The muscle passes through the axilla, and attaches the medial side of the humeral shaft, at the level of the deltoid tubercle.

Question 4

Function of triceps brachii

Answer 4

Extension of the arm at the elbow.

Question 5

Function of biceps brachii

Answer 5

Supination of the forearm. It also flexes the arm at the elbow and at the shoulder.

Question 6

Function of Brachialis

Answer 6

Flexión at elbow

Question 7

Function of Coracobrachialis

Answer 7

Flexion of the arm at the shoulder, and weak adduction.

Question 8

Attachments of biceps brachii

Answer 8

Long head originates from the supraglenoid tubercle of the scapula, and the short head originates from the coracoid process of the scapula. Both heads insert distally into the radial tuberosity and the fascia of the forearm via the bicipital aponeurosis.