bra·chi·alis .brā-kē-'al-əs, -'āl-, -'äl- n a flexor that lies in front of the lower part of the humerus whence it arises and is inserted into the ulna
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n.
a muscle that is situated at the front of the upper arm and contracts to flex the forearm. It works against the triceps brachii.
Medical dictionary. 2011.