Which muscle lies between the coracoid process and the upper arm?

Which muscle lies between the coracoid process and the upper arm?

• A. Brachialis muscle
• B. Deltoid muscle
• C. Coracobrachial muscle
• D. Supraspinatus muscle

Answer: (C)

Coracobrachialis is the muscle that lies between the coracoid process and the upper arm. It originates from the coracoid process of the scapula and inserts on the medial side of the humerus, so it runs directly from the scapular region toward the upper arm. This positioning makes it the connector between the coracoid and the arm, physically situated in the anterior, medial aspect of the arm. Functionally, it helps flex and adduct the shoulder. The other muscles don’t bridge the coracoid to the humerus. Brachialis starts on the humerus and attaches to the ulna, not near the coracoid. Deltoid attaches from the clavicle, acromion, and spine of the scapula to the humerus and surrounds the shoulder without running from the coracoid. Supraspinatus originates in the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus, not linking to the coracoid.

Coracobrachialis is the muscle that lies between the coracoid process and the upper arm. It originates from the coracoid process of the scapula and inserts on the medial side of the humerus, so it runs directly from the scapular region toward the upper arm. This positioning makes it the connector between the coracoid and the arm, physically situated in the anterior, medial aspect of the arm. Functionally, it helps flex and adduct the shoulder.

The other muscles don’t bridge the coracoid to the humerus. Brachialis starts on the humerus and attaches to the ulna, not near the coracoid. Deltoid attaches from the clavicle, acromion, and spine of the scapula to the humerus and surrounds the shoulder without running from the coracoid. Supraspinatus originates in the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus, not linking to the coracoid.