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Brachialis muscle

Synonym: upper arm muscle
German: Musculus brachialis

1 Definition

The brachialis muscle belongs to the group of the muscles of the upper arm.

2 Devolution

The brachialis muscle origins at the anterior margin (Margo anterior) and at the front surface (Facies anterior) of the distal half of the humerus, as well as at the medial intermuscular septum (of the arm) and - with smaller parts - the lateral intermuscular septum (of the arm). The muscle fibers converge to one thick tendon that inserts in the ulnar tuberosity and in the anteroinferior surface of the coronoid process of the ulna.

3 Innervation

The innervation of the brachialis muscle is provided by the musculocutaneous nerve from the brachial plexus (segments: C5-C6, possibly in parts from C7). A smaller part is innervated by the radial nerve. These fibers probably serve proprioception.

4 Function

Together with the biceps muscle, the brachialis muscle is responsible for the flexion of the forearm in the elbow joint.

Since it inserts in the ulna, the brachialis muscle flexes the forearm in pronation as well as supination position, in contrast to the biceps muscle. Since it passes only one joint, its influence on the flexion of the forearm is stronger than the influence of the biceps. Therefore, it is the strongest flexor in the elbow joint.

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