What is the radius the insertion point for?

The radius serves as the insertion point for the biceps brachii muscle, which is primarily responsible for flexing the elbow and supinating the forearm. The biceps brachii has two heads—the short head and the long head—both of which converge to insert on the radial tuberosity of the radius. This anatomical feature is critical because it allows the muscle to effectively exert force on the radius during movements such as lifting or turning the palm upwards.

The interaction between the biceps brachii and the radius is essential in various functional activities, emphasizing the importance of this muscle's insertion point. The other muscles listed do not insert onto the radius; for instance, the triceps brachii inserts onto the olecranon of the ulna, the flexor carpi radialis is involved in wrist flexion and inserts on the base of the second and third metacarpals, and the brachialis inserts onto the coronoid process of the ulna. Understanding the specific insertion points of these muscles helps clarify their functions in relation to the forearm and hand movements.