What muscle rotates your hand so it faces upward?

The muscle that rotates your hand to face upward is the Supinator. This muscle is specifically designed for the action of supination, which is the movement that turns the palm up or forward. Located in the forearm, the Supinator wraps around the upper part of the radius and helps to rotate the radius over the ulna, effectively allowing the hand to turn palm-up.

Understanding the role of the Supinator is particularly important for any activities or movements requiring wrist rotation, such as using a screwdriver or turning a door handle. The Supinator works in conjunction with other muscles like the biceps brachii, but it is the primary muscle responsible for this specific rotational movement.

The Flexor Carpi, while involved in movements of the wrist, is primarily responsible for wrist flexion rather than rotation. The Abductor Pollicis pertains to the movement of the thumb, facilitating its abduction away from the hand, and the Pronator Teres is actually involved in the opposing motion known as pronation, which turns the palm downward. Therefore, the Supinator stands out as the muscle that enables the palm-up position.