Which muscle turns the hand outward so that the palm faces upward?

The muscle responsible for turning the hand outward so that the palm faces upward is the supinator. This action is known as supination, which involves rotating the forearm so that the palm is oriented upwards. The supinator muscle wraps around the upper third of the radius and, when it contracts, it effectively rotates the radius around the ulna, allowing for this outward hand position.

Understanding this action is important in nail technology, as many procedures and techniques require the hand to be in specific orientations. Recognizing how the muscles function to position the hand properly will enhance the ability to provide effective services to clients.