Glossary of Terms

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Interneurons -  The most abundant type of neuron in the central nervous system. They are the “middlemen” of nerve circuitry that connect only to other neurons, not to sensory cells or muscles, and help transmit nerve impulses. Interneurons are crucial determinants of many rhythmic motor behaviors.
Intracellular Matrix -  The filamentous material surrounding cells. It contains nourishment for cells as well as molecules that tell them what to do, including some that guide growing axons.

Courtesy Christopher Reeve Foundation