Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Electron Microscope Studies on Alveolar Cells from Mammals A. PoLiCARD, A. Collet and S. Pregermain with technical assistance of C. Reuet Centre d'Etudes et Recherches des Charbommges de Fiance, Paris- Vernenil en Halatte, France The general organization of alveolar walls studied with electron microscopy seems now to have been made quite clear as a result of recent investigations (1-10, 14-16). Our work, based on the findings of these authors
Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Electron Microscope Studies on Alveolar Cells from Mammals A. PoLiCARD, A. Collet and S. Pregermain with technical assistance of C. Reuet Centre d'Etudes et Recherches des Charbommges de Fiance, Paris- Vernenil en Halatte, France The general organization of alveolar walls studied with electron microscopy seems now to have been made quite clear as a result of recent investigations (1-10, 14-16). Our work, based on the findings of these authors and on our own results, led us to the schematic representation shown in figure 1. The true alveolar wall consists of a connective space containing an amorphous substance of weak electron density, of collagen fibrils and septal histiocytic cells. The septal space is limited on either side by a vitreous basement membrane. This basement membrane forms an Y- shaped connection with the capillary basement mem- brane, thus incorporating in a peculiar way the blood vessels in the alveolar wall. The basement mem- branes are covered continuously with a thin cytoplas- mic layer produced from the small alveolar cells and having the appearance of very long prolongations. At long intervals, large alveolar cells, partly capped by the cytoplasmic layer from the small cells, are attached to the basement membrane. Finally, free cells are seen in the alveolar cavity. The object of this paper is to discuss some of the aspects of the ultrastructure of the large alveolar cells and to define the problems arising from them. Fig. L Semi-diagrammatic representation of the general structure of the lung alveolus. 1, capillary endothelium; 2, cytoplasmic layer: .?, septal space: 4, vitreous basement membrane; 5, endothelial ceil junction: 6, intraseptal cell; 7, alveolar cells (large, small and free); 8, collagen fibrils; 9, elastic fibers. On the other hand, evidence is presented on the pathological ch
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