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Extra info for The Development of the Visual System of the Albino Rat
Electron microscopically regular orientation of the rough endoplasmic reticulum into large Nissl bodies is seen in the neurons of the different collicular layers. Adult forms of oligodendrocytes and astrocytes also may be identified. 42 The identification of numerous intermediate glial elements remains very difficult. The extracellular space has been markedly reduced by the proceeding development of the neuropil and now corresponds to that in the adult central nervous system. Visual cortex. In the marginal zone which has again increased in width satellite glia cells at the side of a few neurons and small, dark, polymorphous cells are found.
The majority of the organelles appears to lie in the part of the perikaryon that is directed towards the pial basement membrane. While most authors (see above) reported the existence of at least a few profiles of granular endoplasmic reticulum, Meller et al. (1966) postulated that the ventricular cells as well as the primitive preneurons are characterized by the lack of granular endoplasmic reticulum. This could not be confirmed in our studies. The perikarya of the ventricular cells as well as their inner processes are situated very closely together so that the extracellular spaces between them are not larger than those found in the adult central nervous system.
They are comparable to the medium dark cells of the middle third of the inner nuclear layer. In addition to the capillaries in the ganglion cell layer and the optic nerve fiber layer a few vessels appear in the inner plexiform layer and at the inner margin of the inner nuclear layer. The pigment epithelium neither light nor electron microscopically shows distinct progress in differentiation. 3* 35 Fig. 14. Frontal section of the rat occipital cortex on the third day of life. Typical astroblast that begins to surround a capillary.