Brachialis muscle

Last revised by Dr Daniel J Bell on 28 Aug 2021

The brachialis muscle is one of the three muscles of the anterior compartment of the arm. It is only involved in flexion at the elbow and therefore the strongest flexor at the elbow, compared with the biceps brachii which is also involved in supination because of its insertion on the radius.


Variant anatomy

Although rare, supernumerary heads of brachialis have been reported and may cause entrapment of the median nerve and/or brachial artery 3.

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