A muscle of the upper arm that originates from the coracoid process of the shoulder blade and inserts on the inner side of the humerus, functioning to flex and medially rotate the shoulder.
From coracoid (shoulder bone) + brachial (arm) + Latin -is (noun marker). A term established in 16th-century anatomical texts to name this specific muscle.
The coracobrachialis is one of the most frequently injured muscles in overhead athletes like baseball pitchers because it's deep in the shoulder and gets stressed every time they throw—it's the hidden troublemaker of shoulder injuries!
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