PMID: 13563541Jul 25, 1958Paper

Structural alterations in nerve fibers produced by hypotonic and hypertonic solutions

The Journal of Biophysical and Biochemical Cytology
J D ROBERTSON

Abstract

In sections of KMnO(4)-fixed, developing mouse sciatic nerves, the central gap of mesaxons in myelinating fibers is normally closed with close apposition of the outside approximately 20 A dense strata of the two approximately 75 A Schwann cell membranes. The two combined outside strata make the intraperiod line bisecting each myelin lamella. The approximately 150 A mesaxon is elaborated spirally around the axon in either a right hand or left hand spiral, and its inside (cytoplasmic) approximately 20 A strata in apposition form the major dense lines of myelin. In hypotonic solutions the lamellae of adult frog sciatic myelinated fibers split apart along the outside membrane strata apposed at the intraperiod line throughout the spiral. Under similar conditions the inside (cytoplasmic) strata of the membranes, in apposition at the major dense lines, do not separate. The approximately 150 A membranous structure resulting from this is called an "internal compound membrane." The double membranes of normal and control frog sciatic unmyelinated fibers have a central gap approximately 100 to 150 A wide. After soaking in 4 to 10 times normal strength Ringer solution or 10 N sucrose-Ringer solution, this gap closes and a membranous structu...Continue Reading

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