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/suÂ·piÂ·naÂ·tion/ (sooâ³pÄ­-naÂ´shun) [L. supinatio ] the act of assuming the supine position, or the state of being supine. Applied to the hand, the act of turning the palm forward (anteriorly) or upward, performed by lateral rotation of the forearm. Applied to the foot, it generally implies movements resulting in raising of the medial margin of the foot, hence of the longitudinal arch.
The biceps brachii crosses two joints - the shoulder and the elbow - so it can influence movement of both joints. The biceps brachii can bring about a variety of movements when it shortens, including: Supination: turning the palm upward. Let one arm hang with your palm facing behind you. When your biceps brachii contracts, it tugs on the radius and pulls it to the outside. This turns your palm to face forward.