By Michael Locke
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Experiments were also performed in which nerve fibers were soaked in hypertonic Ringer solutions of different concentrations before fixation, again with an iso tonic fixative. It was found that increasing the total molarity of the FIG. 43. Diagram to illustrate the effects of hypotonic solutions on myelinated nerve fibers. ) swells in hypotonic solutions and the gap between the mesaxon (m) unit -membranes (u) widens. T h e intraperiod line is split open throughout the sheath, but the membranes fail to separate where they are united along their cytoplasmic surfaces.
Outside this there is much collagen and a multilayered cellular perineurial sheath. A portion of this can be seen at the bottom of Fig. 27, and a satellite cell nucleus is shown in Fig. 28. An experiment was performed to determine the effects of fixing such nerve fibers in solutions of different tonicities. 6% permanganate was dissolved in distilled water and at the other the same percentage of permanganate was dissolved in sea water that had been concentrated 6 times by boiling. Solutions of intermediate values of tonicity were made up by dissolving the same amount of permanganate FIG.
If membranes are syn- FIG. 20. Diagram showing a possible mechanism for mitochondrial origin. At arrows 1, 2, and 3 fingerlike invaginations of cytoplasmic matrix into the cavity of a large endoplasmic reticulum cisterna are shown. T w o of these meet in the mitochondrion to the upper left, to produce a transverse or continuous septum like the ones frequently seen in liver mitochondria. T h e two lower mitochondria are very much like the ones seen in developing nerve fibers. thesized de novo from the cytoplasmic matrix, one should see transi tional forms between unit membrane-bounded vesicles and smaller spherical lipid micellar constituents.