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The Nervous System 2 Main Parts •Central Nervous System –Brain –Spinal Cord (click on left picture to play) •Peripheral Nervous System –Nerve Cells (click on right picture to play) Neurons • Neurons are nerve cells that send and receive messages from other structures in the body. – Sensory Neurons – Carries information received by the senses to the central nervous system (CNS). – Motor Neurons – Carries information from the CNS to muscles and glands. Neurotransmitters • Chemical messages contained in sacs in axon terminal. • Shoots out like a spray bottle. • Specific types – each fit on specific receptors.