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Laboratory 10. Joints of the Upper Extremity
Step 5. Radioulnar Joints

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The rotation of the radius about the ulna results in the movements of supination (the palmar surface of the hand is rotated upward or anterior) and pronation (the palmar surface of the hand is rotated downward or posterior).

Hint: A helpful memory trick is to remember that the movement of supination enables us to hold a bowl of "soup" in our hand.

Links and References:
Grant's: 6.76C
Netter (1ed.): 413 (2ed.): 409
Rohen/Yokochi: 357 and 359