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.
Attachments of the brachialis muscle
Origin: Originates from the medial and lateral surfaces of the humeral shaft
Insertion: Inserts into the ulnar tuberosity, just distal to the elbow joint
Actions of the brachialis muscle
Flexion at the elbow joint
Nerve supply of the brachialis muscle
Musculocutaneous nerve, with contributions from the radial nerve
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Upper Extremity Muscle Atlas
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