Abstract
The lengths of uncompacted and partly compacted oligodendroglial sheaths in the developing rat spinal cord (SC) ventral funiculus (ages F19 and F21) and corpus callosum (CC; ages P12 and P17) were studied by serial section electron microscopy. The average newly formed uncompacted sheath is 21 and 33 μm long in the SC (F19) and CC (P12), respectively, many being less than 10 μm. In these early series, approximately 23 of the analysed axon length is unensheathed. The average partly compacted sheath is 102 and 69 μm long in the SC (F21) and CC (P17), respectively. Here, about 13 of the examined axon length is unensheathed. These results suggest that oligodendroglial sheaths initially are very short, and that they elongate actively before and during compaction. The limited unensheathed space along these axons indicate that some early sheaths must be eliminated.
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