Muscles of the Anterior Arm

Question 1

coracobrachialis

Answer 1

origin: coracoid process of the scapula
insertion: medial aspect of the humerus, mid-shaft
innervation: musculocutaneous N. (C5-C6, minor contribution from C7)
action: flexion at the shoulder joint

Question 2

biceps brachii

Answer 2

origin: supraglenoid tubercle (long head), coracoid process of the scapula (short head).
insertion: radial tuberosity
innervation: musculocutaneous N. (C5-C6, minor contribution from C7)
action: flex. at the elbow joint, flex. at the shoulder joint (weak), supination

Question 3

brachialis

Answer 3

origin: anterior aspect of the humerus, lower 1/2
insertion: ulnar tuberosity
innervation: musculocutaneous N. (C5-C6, minor contribution from C7)
action: flex. at the elbow joint