According to the University of Washington, the muscular system works with the bones to allow for body movement. The nervous system allows messages to be carried to and from different muscles from the brain and aids in coordinating movements.
The bones of the body are joined together to create the skeletal system. The University of Washington explains that this system is the framework of the body. It helps individuals to be able to stand, sit and move. However, the skeletal system cannot create, maintain and control movement on its own. Contractions of the muscles affect the movement and direction of different parts of the skeletal system depending on the electrical impulses that are sent from the brain, which requires the involvement of the third system, the nervous system.