Hey you yes you, I have the answer you need!
The brain sends messages via the spinal cord to peripheral nerves throughout the body that serve to control the muscles and internal organs. The somatic nervous system is made up of neurons connecting the CNS with the parts of the body that interact with the outside world.
Hope this helps!!
The Brain Stem connect the Spinal Cord to the brain and the Spinal Cord is what connects the entire nervous system. Hope this helps you!