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Medical Term:

node of Ranvier

Pronunciation: rahn-vē-ā′

Definition: a short interval in the myelin sheath of a nerve fiber, occurring between each two successive segments of the myelin sheath; at the node, the axon is invested only by short, fingerlike cytoplasmic processes of the two neighboring Schwann cells or, in the central nervous system, oligodendroglia cells.

See Also: myelin sheath