The proximal radioulnar joint connects which two forearm bones?

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Multiple Choice

The proximal radioulnar joint connects which two forearm bones?

Explanation:
Rotation of the forearm is enabled by joints that link the two forearm bones, the radius and the ulna. At the proximal (near the elbow) end, the head of the radius sits in the radial notch of the ulna, with the annular ligament wrapping around the head to keep it in place while allowing rotation. This setup forms the proximal radioulnar joint, whose main role is to permit pronation and supination of the forearm. The other options don’t fit because: the radius-to-radius link would involve the same bone, the ulna-to-humerus describes the elbow joint, and the radius-to-carpal describes the wrist joint.

Rotation of the forearm is enabled by joints that link the two forearm bones, the radius and the ulna. At the proximal (near the elbow) end, the head of the radius sits in the radial notch of the ulna, with the annular ligament wrapping around the head to keep it in place while allowing rotation. This setup forms the proximal radioulnar joint, whose main role is to permit pronation and supination of the forearm. The other options don’t fit because: the radius-to-radius link would involve the same bone, the ulna-to-humerus describes the elbow joint, and the radius-to-carpal describes the wrist joint.

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