Glossary of Terms

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Receptors -  Millions of protein molecules, posted like sentinels around a cell membrane to screen the environment for messages addressed to them. Receptors are highly selective, usually responding to only one type of directive. The meeting of a messenger molecule, or ligand, with its receptor initiates a reaction inside the cell that ultimately affects what the cell does.
Rubrospinal tract -  One of the major descending nerve pathways from the brain to the spinal cord.

Courtesy Christopher Reeve Foundation