Brachialis

Musculus brachialis

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The brachialis lies deep to the biceps and is the prime mover of pure elbow flexion, working in every forearm position because it inserts on the ulna and does not supinate. Hammer curls and reverse curls, where supination is removed, bias load onto the brachialis (and brachioradialis), and a well-developed brachialis pushes the biceps up to add visible arm width. It is a major contributor to elbow-flexion strength that is often under-trained.

Actions

Elbow flexion

Origin

Anterior surface of the humerus, particularly the distal half

Insertion

Coronoid process and tuberosity of the ulna

Innervation

Musculocutaneous nerve (C5–C7); small radial nerve (C5–C6) contribution

Blood supply

Muscular branches of the brachial artery and the radial recurrent artery

Wikipedia ↗

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