What term is used to describe the end of a muscle that remains stationary during contraction?

The term that describes the end of a muscle that remains stationary during contraction is known as the origin. The origin is typically the more proximal attachment of the muscle and serves as the anchor point, allowing the muscle to generate movement at the joint when it contracts. In contrast, the insertion is the part of the muscle that moves during contraction, which is usually located farther away from the center of the body. Understanding this distinction is key in anatomy and physiology, especially when studying how muscles function during movement.