Which term names a muscle located between the coracoid process and the upper arm bone?

• A. Coracobrachial muscle
• B. Deltoid muscle
• C. Brachialis muscle
• D. Teres major muscle

Answer: (A)

In muscle naming, the parts of the name often indicate where the muscle starts and ends. A muscle that sits between the coracoid process and the upper arm bone would carry a name built from coraco- (from the coracoid) and brachial/brachialis (relating to the arm/humerus). Coracobrachial (coracobrachialis) fits exactly: it originates from the coracoid process of the scapula and inserts on the humerus, lying in the space between the coracoid and the upper arm bone. That placement is what the name conveys. The other muscles have different origins and insertions that don’t describe a path between the coracoid and the humerus. Deltoid attaches from clavicle/scapula to the deltoid tuberosity on the humerus; brachialis runs along the front of the humerus to the ulna; teres major comes from the inferior angle of the scapula to the humerus.