Membrane architecture of myelinated nerve fibres in the human dental pulp studied by freeze-fracturing
- PMID: 3857028
- DOI: 10.1016/0003-9969(85)90103-7
Membrane architecture of myelinated nerve fibres in the human dental pulp studied by freeze-fracturing
Abstract
The outer surface of the myelin sheath was well visualized in electron micrographs of replicas and the distribution of its cytoplasm-containing portions could be analysed. Numerous caveolae, probably representing the surface stomata of endo- or exocytotic vesicles were found on the plasmalemmal surface overlying organelle-rich cytoplasmic regions. Membrane specializations of the tight-junction type were found at the outer and inner mesaxons of the myelin sheath as well as at the Ranvier node and Schmidt-Lanterman incisures. Presuming that so-called leakiness is related to the junctional morphology, these junctions would be classified as moderately leaky. The morphological features of the Schwann-cell nuclear envelope were essentially as described for other mammalian cells.
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