Answer:
The joint is formed by the capitulum (or capitellum) and the proximal radius/head of radius is (a) Elbow joint.
Step-by-step explanation:
The joint formed by the capitulum (or capitellum) and the proximal radius/head of the radius is the elbow joint. Specifically, the capitulum is a rounded projection on the lateral side of the distal humerus, while the head of the radius articulates with it, creating a pivotal connection. This complex articulation allows for the flexion and extension of the forearm, as well as some degree of pronation and supination.
The elbow joint plays a crucial role in the functional movement of the upper limb, enabling actions such as lifting, carrying, and reaching.
Option A is correct.