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New PDF release: Cellular Membranes in Development

By Michael Locke

ISBN-10: 0123955335

ISBN-13: 9780123955333

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Note the distinct gaps between the axon-Schwann and inter-Schwann cell unit membranes, as well as the gap in the one mesaxon (m) shown. 44,000 χ . 45 FIG. 41b. Membrane relationships in a similar mature unmyelinated mouse sciatic fiber at higher magnification. 184,000 χ . 46 UNIT MEMBRANES 47 brane and the axon membrane over the juxtaterminal myelinated region at nodes of Ranvier. In the differentiation of nonmyelinated nerve fibers an interesting sequence of unit membrane contact relationships occurs.

After 2-3 weeks of development 48 J . DAVID ROBERTSON from birth of mouse sciatic nerve fibers most of the axons have reached this stage and the gaps between the membranes have opened up to the 100-150 Ä width seen in adult fibers, like the ones shown in usual Fig. 41a,b. T h e sequence of fiber development is diagrammatically out­ lined in Fig. 42a-d. Experimental Alterations in Membrane Contact Relationships It seems clear from the previous discussion that specific contact relation­ ships between the surface membranes of adjacent cells are maintained in tissues, and that such contacts may have physiological significance.

Transection of a portion of an Octopus optic nerve fiber fixed with O s 0 4 , embedded in Araldite, sectioned, and stained with uranyl acetate. T h e bundles of axons are surrounded by thin sheetlike extensions of satellite glia cells. These are traced and filled in (in black) in b. Note that there is at least one mesaxon for each bundle of axons. Outside the satellite cells there is a basement membrane, collagen fibrils, and a lamellated perineuria! sheath (far right). 9 , 6 0 0 χ . 30 UNIT MEMBRANES 31 cells to their bases and this surely is reflected in differences in the chemical composition of the bounding unit membranes.

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Cellular Membranes in Development by Michael Locke

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