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Jean-Marie Peyronnard, MD, FRCP(C); Leon Cass Terry, MD; Albert Aguayo, MD, FRCP (C)

Arch Neurol. 1975;32(1):36-38.

Abstract
The interrelation of Schwann cells in developing rat cervical sympathetic trunk was studied by measuring distances between consecutive Schwann cell nuclei in teased unmyelinated nerve fiber bundles (Remak fibers). From 300 to 400 internuclear Schwann cell distances (INDs) were measured at ten days and 2, 4, 5, 6, 8, 12, and 16 weeks after birth. Median INDs increased from 54µm at ten days to reach adult values (90µm to 100µm) at 16 weeks of age. Mean axonal diameters measured in the contralateral cervical sympathetic trunk increased from 0.57µm to 0.69µm during the same period. Developmental changes in median INDs of Schwann cells correlated significantly with age but did not parallel increases in axonal diameter.

Author Affiliations
From the Division of Neurology, Department of Medicine, Montreal General Hospital and Hotel-Dieu Hospital, Montreal.

Footnotes
Accepted for publication May 13, 1974.

Reprint requests to Division of Neurology, Montreal General Hospital, Montreal, Canada.

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