What is the insertion of the supinator?

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Multiple Choice

What is the insertion of the supinator?

Explanation:
The main idea is where the supinator attaches to the bone to produce forearm rotation. The muscle wraps around the upper part of the radius and inserts on its lateral surface near the proximal end. This placement lets the supinator pull the radius around the ulna to rotate the forearm, especially when the elbow is flexed. The other sites described wouldn’t allow the radius to be rotated effectively: attaching to the medial surface of the distal radius, the posterior surface of the ulna, or the lateral surface of the distal humerus wouldn’t provide the correct leverage or location to rotate the radius.

The main idea is where the supinator attaches to the bone to produce forearm rotation. The muscle wraps around the upper part of the radius and inserts on its lateral surface near the proximal end. This placement lets the supinator pull the radius around the ulna to rotate the forearm, especially when the elbow is flexed. The other sites described wouldn’t allow the radius to be rotated effectively: attaching to the medial surface of the distal radius, the posterior surface of the ulna, or the lateral surface of the distal humerus wouldn’t provide the correct leverage or location to rotate the radius.

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