Summary
The anterior chamber of the swimbladder of the toadfish Opsanus tau L. is lined by a single layer of columnar gas gland cells, cuboidal cells that resemble gas gland cells but are located outside of the gas gland region, and squamous cells. Multilamellar bodies are numerous in the gas gland cells and the cuboidal cells and are present in smaller numbers in the squamous cells. Capillaries lie in the lamina propria directly below the epithelial lining. A thick continuous muscularis mucosae and a submucosa consisting of tightly packed cells, cell processes, and connective tissue may contribute to the impermeability to gases of the wall of the anterior chamber.
The posterior chamber of the swimbladder is lined by a single type of squamous epithelial cell. Multilamellar bodies were occasionally observed in these cells also. Other types of cells frequently form a partial second layer between the epithelial lining and the basement lamina. A thin muscularis mucosae lies directly below the basement lamina and the capillaries of the posterior chamber are located in the submucosa. The tunica externa is a layer of dense connective tissue that surrounds both the anterior and posterior chambers. Collagen fibrils in the form of tactoids are present in this layer.
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Part of this work was submitted by S.M.M. in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Biology Department, Boston University. S.M.M. is grateful for a National Science Foundation Traineeship.
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Morris, S.M., Albright, J.T. The ultrastructure of the swimbladder of the toadfish, Opsanus tau L.. Cell Tissue Res. 164, 85–104 (1975). https://doi.org/10.1007/BF00221697
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DOI: https://doi.org/10.1007/BF00221697