| Term | Definition |
| Autonomic Nervous System (ANS) | nerves that carry involuntary impulses to smooth muscle, cardiac muscle, and various glands |
| Central Nervous System | the portion of the vertebrate nervous system consisting of the brain and spinal cord |
| Axon | long fiber that carries impulses away from the cell body of a neuron |
| Cerebral Spinal Fluid | A solution that fills the hollow cavities of the brain and circulates around the brain and spinal cord. Provides nourishment, cushions, and removes wastes. |
| Dendrites | branching extensions of neuron that receives messages from neighboring neurons |
| Electroencephalogram (EEG) | a graphical record of electrical activity of the brain |
| Interneurons | Central nervous system neurons that internally communicate and intervene between the sensory inputs and motor outputs |
| Motor Neurons | neurons that carry outgoing information from the central nervous system to the muscles and glands |
| Neuron | a nerve cell; the basic building block of the nervous system |
| Peripheral Nervous System | the sensory and motor neurons that connect the central nervous system to the rest of the body |
| Sensory Neurons | neurons that carry incoming information from the sense receptors to the central nervous system |
| Synapse | the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle |