Which muscle flexes the elbow and supinates the forearm, originating from the coracoid process and the tubercle above the glenoid cavity?

• A. Brachialis
• B. Biceps Brachii
• C. Pronator Teres
• D. Flexor Carpi Radialis

Answer: (B)

This question tests identifying a muscle that can both bend the elbow and rotate the forearm to turn the palm upward. The biceps brachii does exactly that: it flexes the elbow and, when the forearm is flexed, rotates the radius to produce supination. It has two heads—one from the coracoid process and the other from the supraglenoid tubercle (the tubercle above the glenoid cavity)—which converge to insert on the radial tuberosity (via the bicipital tendon). That anatomy underlies its dual action: elbow flexion and forearm supination.

The other options don’t fit as well. The brachialis strongly flexes the elbow but does not contribute to forearm rotation. The pronator teres pronates the forearm, not supinates. The flexor carpi radialis acts on the wrist rather than the elbow or forearm rotation.