ANATOMY

Detailed explanation-1: -Supination describes the motion of turning the palm anteriorly (Fig. 1.14). Most often these motions occur with the hands in front of the body to accommodate grasping and holding types of activities, so supination is considered turning the palm of the hand upward, and pronation is considered turning the palm downward.

Detailed explanation-2: -The biceps is named for its two heads – short and long. The biceps is the main supinator of the forearm (which helps us rotate the palm up and down), and helps the brachialis and brachioradialis in bending the elbow.

Detailed explanation-3: -Supination and pronation are terms used to describe the up or down orientation of your hand, arm, or foot. When your palm or forearm faces up, it’s supinated. When your palm or forearm faces down, it’s pronated.

Detailed explanation-4: -Pronation-A rotation of the forearm that moves the palm from an anterior-facing position to a posterior-facing position, or palm facing down.

Detailed explanation-5: -When the hand is turned so that the palm faces backwards and the thumb points down, this is referred to as pronation. It is due to the rotation of the proximal radioulnar joint, and results in the radius crossing over the ulna.