Which structure serves as an insertion for the biceps brachii?

Which structure serves as an insertion for the biceps brachii?

• A. Olecranon process of ulna
• B. Medial epicondyle of humerus
• C. Radial tuberosity
• D. Coronoid process of ulna

Answer: (C)

Biceps brachii inserts distally on the radial tuberosity. The tendon from the two heads converges to attach at this rough area on the radius, with additional attachment via the bicipital aponeurosis to the forearm fascia. This insertion lets the muscle flex the elbow and, when the forearm is supinated, contribute to forearm rotation. The other structures correspond to different muscles or actions: the olecranon process is the insertion for the triceps brachii; the medial epicondyle is a common origin for many forearm flexors; the coronoid process is an insertion for brachialis. Therefore, the radial tuberosity is the correct insertion for the biceps brachii.

Biceps brachii inserts distally on the radial tuberosity. The tendon from the two heads converges to attach at this rough area on the radius, with additional attachment via the bicipital aponeurosis to the forearm fascia. This insertion lets the muscle flex the elbow and, when the forearm is supinated, contribute to forearm rotation.

The other structures correspond to different muscles or actions: the olecranon process is the insertion for the triceps brachii; the medial epicondyle is a common origin for many forearm flexors; the coronoid process is an insertion for brachialis. Therefore, the radial tuberosity is the correct insertion for the biceps brachii.