Brachialis: Origin, Insertion, Nerve Supply & Action

Brachialis: The brachialis is a muscle in the upper arm that flexes elbow joint. It lies deeper in the biceps brachii and a synergist action that assists the biceps brachii in flexing at the elbow. The brachialis muscle forms the floor of the cubital fossa. The brachialis muscle is the prime mover of elbow flexion.Brachialis Muscles

Attachments of the brachialis muscle


Originates from the medial and lateral surfaces of the humeral shaft


Inserts into the ulnar tuberosity, just distal to the elbow joint


Actions of the brachialis muscle

Flexion at the elbow joint

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Nerve supply  of the brachialis muscle

Musculocutaneous nerve, with contributions from the radial nerve