What is the first system to develop? What is the only system completely protected by bone? What is the only system connected to every other system, organ, gland, tissue and cell in your body? If you have not guessed it by now, it is your Nervous System. The Nervous System is made up of your brain, spinal cord and all your nerves that branch of the cord. It essentially directs and coordinates everything in your body. Information goes down to the body and information flows back up to the brain. It is of the utmost importance that this communication is free and clear of any interference for your Nervous System to do its job effectively. Remember this, nature needs no help, just no interference.