This is movement of the forearm around the elbow so that the palm now faces backward from the original anatomical position in which the palm faces forwards. Movement which exclusively occurs in the proximal and distal radio-ulnar joints of the forearm in which the radius turns on the ulna through 180 degrees, moving the radius from a lateral to a medial position. It is aided by muscles called pronators - e.g. pronator teres, pronator quadratus.

 

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