Summary
The cells of the peritoneum of the mouse have been examined with the electron microscope both by studying the gastro-splenic omentum and by washing the cells out of the peritoneal cavity. They comprise mesothelial cells, mast cells, lymphocytes and macrophages. The mesothelial cells were probably nearly all degenerate. The mast cells released granules which were phagocytosed by the other cells. The lymphocytes were either classical small lymphocytes, or rather larger cells similar to previously described immunoblasts. The macrophages varied considerably in size. Some were probably derived from the covering cells of the milk spots. They contained varying numbers of dense bodies, with the structure of lysosomes. A series of appearances was seen which suggested that these were synthesized in the granular endoplasmic reticulum. A gradation of structure was seen between lymphocytes and small macrophages.
The gastro-splenic omentum consisted of two layers of mesothelium, in places fenestrated. The milk spots which were scattered throughout this structure were covered by cells similar to macrophages, and had a core of lymphoid cells in which ran a small blood vessel. The most notable difference between the mesothelial cells and the macrophages was the presence of many small caveolae at the surface of the mesothelial cells, and of larger vacuoles and indentations at the surface of the macrophages.
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Acknowledgements. I am grateful to Professor R. Barer for much advice and criticism, to Dr. G. A. Meek for guidance on electron microscopy, and to Miss M. Tune and Mr. M. Turton for photographic assistance.
This work was supported by a grant from the Medical Research Council and by grants to the Department from the S.R.C., Nuffield Foundation and Unilever Limited.
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Carr, I. The fine structure of the cells of the mouse peritoneum. Z. Zellforsch. 80, 534–555 (1967). https://doi.org/10.1007/BF00330721
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DOI: https://doi.org/10.1007/BF00330721