What is the term for the muscles that turn the hand inward so the palm faces down?

The term that describes the muscles responsible for turning the hand inward so that the palm faces downward is "pronators." These muscles play a crucial role in the movement of the forearm and hand by facilitating pronation, which is the action of rotating the forearm so that the palm turns towards the ground.

In the context of nail technology and any related practices, understanding muscle function is important for hand and wrist health, proper technique, and preventing strain or injury during various tasks, such as manicures or applying nail products.

The other options relate to different muscle functions: supinators are responsible for turning the palm upward, flexors are involved in bending the joints, and extensors are associated with straightening or extending the joints. Each set of muscles serves distinct roles in forearm and hand movement but does not specifically relate to the inward turning of the hand.