Motor function refers to the ability of a muscle or group of muscles to contract and move, allowing for purposeful movement and action. It involves the coordination and control of various body parts in performing specific tasks or movements. Motor functions are controlled by the nervous system, specifically through the activation of motor neurons that transmit signals from the brain to the muscles. These functions can be affected by a variety of factors such as neurological disorders, injuries, or conditions that impact the nerves and muscles involved in movement.