What does supination refer to in forearm movement?

Supination refers to the movement of the forearm that turns the palm of the hand upwards or forwards. In anatomical terms, when a person is in the standard anatomical position, the palms are facing forward. Supination involves rotating the radius around the ulna so that the palm faces up. This action is commonly seen when holding a bowl of soup (hence the term "supination"), as the palm needs to be positioned upwards to hold the soup without spilling it.

Understanding supination is essential for various fields such as medicine, anatomy, and physical therapy, as it relates not only to forearm movement but also to the functioning of the wrist and hand. The other options describe different movements that do not accurately depict supination.