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Nervous System
review
| Term | Definition |
|---|---|
| neuron | a nerve cell |
| brain | specialized group of nerve cells that controls and coordinates activities of the nervous system |
| CNS | portion of nervous system that consists of brain and spinal cord |
| PNS | subdivision of nervous system that contains nerves that bring information to CNS |
| autonomic nerves | control heart rate, breathing, salivary production, etc |
| nerve impulse | message that travels from dendrites of a neuron through the axon |
| axon | nerve fiber that conducts message away from cell body |
| schwann cell | cells that from myelin |
| node of ranvier | gap in myelin that increases speed of impulse |
| synapse | space between 2 neurons through which neurotransmitter traves |
| afferent nerve | receives information from the environment |
| efferent nerve | transmits to muscles or glands that will respond to impulses |
| stimulus | something that causes a response |
| cell body | contains cytoplasm and nucleus |
| myelin | fat layer that surrounds and insulates axons |