The head of the radius articulates medially with which anatomical structure?

The head of the radius articulates medially with the radial notch of the ulna, forming a critical part of the proximal radioulnar joint. This joint allows for the pronation and supination of the forearm, which is essential for various movements of the wrist and hand. The radial notch is a depression on the ulna that specifically accommodates the head of the radius, providing stability and a smooth surface for articulation. This relationship is vital for proper functionality of the forearm and elbow joint, making it an important aspect of anatomy to understand.

Other anatomical structures mentioned, such as the capitulum of the humerus, coronoid process of the ulna, and olecranon of the ulna, play significant roles in the elbow's overall function and articulation with the radius but do not directly articulate with the head of the radius in a medial manner.