Final Answer:
The opposing movement of pronation, in which the palm is turned forward, is called supination.
Step-by-step explanation:
Supination is the anatomical term for the opposing movement to pronation. Pronation involves the rotation of the forearm or hand so that the palm faces backward or downward. In contrast, supination refers to the movement where the palm is turned forward or upward. This motion occurs at the radioulnar joints in the forearm. The muscles responsible for supination include the biceps brachii and supinator muscles. Understanding these terms is crucial in anatomy and physiology, especially when describing movements of the upper limb.
Therefore, the correct answer to the question is that the opposing movement of pronation, where the palm is turned forward, is known as supination.