Autonomic system
Somatic system
Spinal cord
Nerves
Brain
are made of millions of neurons that send messages from the parts of the body to the brain and vice versa.
It is in charge of sending and receiving messages through the nerves.
Nerves that send information from the senses to the brain.
it has plenty of nerves that connect to every organ.
Nerves that control involuntary movements and functions of the body such as digestion, breathing, etc.