The billions of neurons in the brain are connected to neurons throughout the body by trillions of synapses. The nervous system is organized into two parts: the central nervous system, which consists of the brain and the spinal cord, and the peripheral nervous system, which connects the central nervous system to the rest of the body.

Select Page 1) Neurons, The Messengers 2) The Neural Impulse 3) The Synapse 4) Synapses and Drugs 6) The Brain 7) Hemispheric Specialization 8) The Limbic System 9) The Spinal Cord 10) Tools for Studying the Nervous System 11) The Peripheral Nervous System 12) The Endocrine System 13) Behavior Genetics and Our Human Heritage 14) Genetics and Behavior