In anatomy, the<unk>  is a position of the body lying face down. It is opposed to the supine position which is face up. Using the terms defined in the anatomical position, the ventral side is down, and the dorsal side is up. Concerning the forearm,<unk>  refers to that configuration where the palm of the hand is directed posteriorly, and the radius and ulna are crossed. Researchers observed that the expiratory reserve volume measured at relaxation volume increased from supine to<unk>  by the factor of 0.15.
Prone position
Tripod position
Supine position
Knee-chest position
Sims' position
Squatting position
Rose position
Trendelenburg position