What is the distal attachment of the biceps brachii?

The biceps brachii is a muscle with two heads—the long head and the short head—that both originate from different points but converge to have a common distal attachment. The correct distal attachment of the biceps brachii is at the tuberosity of the radius. This structure is important for the muscle's function, as it allows the biceps to play a key role in elbow flexion and supination of the forearm. When the biceps contracts, it pulls on this tuberosity, enabling the arm to bend and rotate the palm upwards.

The other options refer to anatomical locations that relate to either the origin of the biceps brachii or nearby structures, but none of them serve as the correct distal attachment point. Understanding the specific attachment of muscles like the biceps brachii is crucial in fields such as anatomy, physiology, and physical therapy, as this knowledge directly impacts how muscles function during movement.