How do bones muscles and nerves work together?

Skeletal muscles are controlled by nerves from the Peripheral Nervous System. This causes the muscles to contract when they receive the messages transmitted along motor neurons, originating in the motor areas of the cerebral cortex.
The axons of these motor neurons extend out to the muscle where it divides and goes to different muscles.
The motor pathways that carry the nerve impulse from brain to muscle are composed of two neurons:
- Upper motor neurons --> (cell body in the brain)
- Lower motor neurons --> (cell body in the grey matter of the spinal cord)

When a nerve impulse initiates the contraction of a skeletal muscle, it results in movement about a joint.

Hope this helped :)