periaxonal

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periaxonal — Surrounding the axon of a nerve. [peri + G. axon, axis] * * * peri·ax·o·nal (per″e akґsə nəl) near or around an axon … Medical dictionary
Nodes of Ranvier — are known as the gaps (about 1 micrometer in diameter) formed between myelin sheath cells along axons or nerve fibers. OverviewSeveral vertebrate axons are surrounded by a myelin sheath allowing rapid and efficient saltatory propagation of action … Wikipedia
Myelin sheath gap — Drawing of a peripheral nerve axon (labeled axis cylinder ), showing a node of Ranvier along with other features … Wikipedia

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