Where does the coracobrachialis insert?

Where does the coracobrachialis insert?

• A. Medial surface of humerus (just above midpoint)
• B. Lateral surface of humerus
• C. Radial groove
• D. Coronoid process of ulna

Answer: (A)

The coracobrachialis inserts on the medial surface of the humerus, just above the midpoint. This placement follows its course from the coracoid process of the scapula down the medial arm, giving it a line of pull that flexes and adducts the shoulder. Inserting on the medial midshaft aligns with these actions, whereas a lateral humeral insertion would alter the pull, the radial groove is a posterior path for the radial nerve rather than an insertion site, and the coronoid process of the ulna is a forearm insertion point for other muscles like the brachialis.

The coracobrachialis inserts on the medial surface of the humerus, just above the midpoint. This placement follows its course from the coracoid process of the scapula down the medial arm, giving it a line of pull that flexes and adducts the shoulder. Inserting on the medial midshaft aligns with these actions, whereas a lateral humeral insertion would alter the pull, the radial groove is a posterior path for the radial nerve rather than an insertion site, and the coronoid process of the ulna is a forearm insertion point for other muscles like the brachialis.