The urinary bladder of the toad (Bufo marinus) was studied with both the light and the electron microscope. The bladder wall consists of epithelium, submucosa, and serosa. In the epithelium, four different cell types were recognized on the basis of their fine structure and staining properties with several different dyes. These four were designated as granular cells, mitochondria-rich cells, mucous cells, and basal cells. In addition, migratory cells of a different type were found in the basal region of the epithelium. The luminal surface of the epithelial cells presents irregular microvilli and is coated by PAS-positive material which has been further investigated by histochemical procedures and radioautography. Included is a description of the fine structural details of cell membranes, cell junctions, and intracellular components. The submucosa consists of a delicate stroma of fibroblasts and collagen fibers and also contains blood and lymph vessels, unmyelinated nerves, migratory cells, and smooth muscle cells. The serosa consists of a single layer of serosal (mesothelial) cells which form an uninterrupted covering of the viscus. Possible pathways of sodium and water transport across the bladder wall are discussed.
Article|
January 01 1963
THE FINE STRUCTURE OF THE URINARY BLADDER OF THE TOAD, BUFO MARINUS
Jae Kwon Choi
Jae Kwon Choi
From the Department of Anatomy, University of Washington, Seattle, and Chonnam University Medical School, Kwangju, Korea
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Jae Kwon Choi
From the Department of Anatomy, University of Washington, Seattle, and Chonnam University Medical School, Kwangju, Korea
Received:
July 10 1962
Online ISSN: 1540-8140
Print ISSN: 0021-9525
Copyright, 1963, by The Rockefeller Institute Press
1963
J Cell Biol (1963) 16 (1): 53–72.
Article history
Received:
July 10 1962
Citation
Jae Kwon Choi; THE FINE STRUCTURE OF THE URINARY BLADDER OF THE TOAD, BUFO MARINUS . J Cell Biol 1 January 1963; 16 (1): 53–72. doi: https://doi.org/10.1083/jcb.16.1.53
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