. Cytology. Cytology. double membranes separated from each other by an organized hiyer of lipid. This lipid layer constitutes a third membrane, thus giving a three- layered element. Sjostrand also classifies the different membranes as follows: (I) (I cyto-membranes, which are those elements delimiting the. Figure 3-25. Electron Micrograph of Portion of Mucus-secreting Cell in Olfactory Epithelium of the Frog. The basal surface of the cell is at the bot- tom of the tigure, the free surface at the top. Mucin granules (mg) and mitochondria (m) are visible in the cytoplasm. The parallel arrays of
. Cytology. Cytology. double membranes separated from each other by an organized hiyer of lipid. This lipid layer constitutes a third membrane, thus giving a three- layered element. Sjostrand also classifies the different membranes as follows: (I) (I cyto-membranes, which are those elements delimiting the. Figure 3-25. Electron Micrograph of Portion of Mucus-secreting Cell in Olfactory Epithelium of the Frog. The basal surface of the cell is at the bot- tom of the tigure, the free surface at the top. Mucin granules (mg) and mitochondria (m) are visible in the cytoplasm. The parallel arrays of rough- surfaced profiles (er) located in the basal region of the cell represent vertical sections through flattened vesicles or cisternae (500 to 1200 A thick) and are characteristic of the endoplasmic reticulum in this and other protein-secreting cells. The arrays of parallel profiles designated as g represent part of the Golgi complex in these cells. (From Porter, K. R., 1957. "The Submicro- scopic Morphology of the Protoplasm," Harvey Lectures 1955-56, Academic Press, Inc., New York, N. Fig. 7, Page 184.) cisternae; (2) /i cyto-membranes, which are unfoldings of the cell mem- brane into the interior of the cell; and (3) y cyto-membranes, which are smooth-surfaced and generally arranged in parallel as in the Golgi complex. Some European workers, including Sjostrand, have suggested re- placing the term, "endoplasmic reticulum" by the term, "; 54 / CHAPTER 3. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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