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Schwann Cell Internuclear Distances in Normal and Regenerating Unmyelinated Nerve Fibers
Jean-Marie Peyronnard, MD;
Albert J. Aguayo, MD;
Garth M. Bray, MD
Arch Neurol. 1973;29(1):56-59.
Abstract
Schwann cell internuclear distances (INDs) were determined for unmyelinated nerve fiber bundles (Remak fibers) from rat cervical sympathetic trunks (CSTs) and sural nerves, which had been stained with cresyl violet and teased in a glycerin-water mixture. Internuclear distances varied along individual unmyelinated fiber bundles and from one bundle to another, ranging between 20µ to 250µ for CSTs and 20µ to 310µ for the sural nerve. Histograms for seven normal CSTs and the sural nerve were unimodal; median INDs for the CSTs were 90µ to 100µ, and for a normal sural nerve, 108µ. Schwann cell INDs were significantly reduced to 50µ to 60µ in CSTs regenerating after crush injury or transection. This suggests that in regenerating unmyelinated nerve fiber bundles, as in regenerating myelinated fibers, Schwann cell territories are shorter than normal.
Author Affiliations
Montreal
From the Division of Neurology, Montreal General Hospital, Montreal. Dr. Peyronnard is now with the Department of Neurology, Hotel Dieu Hospital, Montreal.
Footnotes
Accepted for publication Feb 21, 1973.
Reprint requests to Division of Neurology, Montreal General Hospital, Montreal (Dr. Aguayo).
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