The brachialis muscle is the major flexor that the elbow. This muscle is located in the anterior compartment the the arm in addition to the Biceps brachii and coracobrachialis.

Origin

Distal anterior element of the humerus, deep to the biceps brachii.

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Insertion

Coronoid process and the ulnar tuberosity.<2>

Nerve

The brachialis muscle is innervated by the musculocutaneous nerve and components the the radial nerve. The radial nerve descends in the groove between the brachialis and brachioradialis muscles, above the elbow. The the muscle in the anterior compartment, the biceps brachii and also the brachialis are innervated by C5 and also C6 nerve roots.<3>


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Artery

Muscular branches that brachial artery, recurrent radial artery.<2>

Function

The brachialis muscle has actually a large cross sectional area, offering it with an ext strength than the biceps brachii and also the coracobrachialis.<4> In stimulate to isolation the brachialis muscle the forearm requirements to be in pronation, as result of the biceps brachii"s role as a supinator and also flexor.<4> by pronating the forearm the biceps is put into a mechanically disadvantage.


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Clinical relevance

The brachialis muscle can be generally injured by recurring forceful contractions or muscular contractions with the arm in hyperextension. This is commonly seen in climbers, as result of the pronation the the hand and the extended started position.<5> Physical task that involve a most pull ups, curls, and also rope climb can additionally initiate brachialis muscle pain.<6> A stress, overload to the brachialis tendon can also cause a patient to existing with doing not have elbow extension as result of painful end-range extending of the tendon. Due to the place of the pain, medial epicondylitis and lateral epicondylitis should also be evaluated.

The brachialis acts as the floor of the cubital fossa<3>, and also is part of the radial tunnel. It may be implicated in Erb"s palsy if the Brachial plexus i do not care injured, resulting in elbow flexion weakness.

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Assessment

To assess the stamin of the brachialis place the elbow at 90 levels of flexion through the forearm fully pronated. Then have actually the patient withstand an inferior force placed on the distal forearm.<7>