Summary
Gill lamellae of a bivalve Anodonta woodiana lauta (v. Martens) were observed by electron microscopy. The Anodonta gill wall consists of a single layer of epithelial cells, its basal lamina and the underlying connective tissue layer. It was confirmed that there is no true endothelium in the vessels and that the connective tissue layer of the vessel wall is therefore in direct contact with the blood. Cells of a specific type referred to as “trabecular cells” lie in the blood lacunae. These cells closely resemble the pillar cells of fish gills, but show certain fundamental differences. Characteristic features of the trabecular cells are (1) an elongated cell body which lies across the vascular lumen and attaches to the vessel wall by means of the tips of their long processes, (2) two types of myofilaments (thick and thin) in the cytoplasm, (3) external dense plaques at the cell surface which are associated with the insertion of myofilaments into the cell membrane, (4) direct contact between the cell surface and the blood except at the regions where the cell is covered by external plaques and connective tissue fibrils. These facts suggest that the Anodonta trabecular cell is not analogous with the pillar cell of fish gills but rather with muscle cells which show a specific morphological modification and a peculiar relationship to the vessel wall due to the absence of the endothelium. These cells are assumed to regulate blood flow within the gill vessels.
As to the permeability of the wall of Anodonta gill vessels, junctional complex consisting of an intermediate and a septate junction between adjacent gill epithelial cells probably plays the main role as a barrier between the blood and the surrounding water. The basal lamina underlying the gill epithelium is assumed to act as a coarse permeability barrier.
Numerous nerve endings of unknown function are observed in the gill epithelium. It is strongly suggested, however, that they are associated with the additional function of the Anodonta gill lamellae as a food-sorting device.
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References
Baccetti, B., Bigliardi, E.: Studies on the fine structure of the dorsal vessel of arthropods. I. The “heart” of an orthopteran. Z. Zellforsch. 99, 13–24 (1969a)
Baccetti, B., Bigliardi, E.: Studies on the fine structure of the dorsal vessel of arthropods. II. The “heart” of a crustacean. Z. Zellforsch. 99, 25–36 (1969b)
Ballard, R. D.: Invertebrate zoology, 2nd ed. Philadelphia-London-Toronto: W. B. Saunders Co. 1969
Borradaile, L. A., Potts, F. A., Eastham, L. E. S., Saunders, J. T., Kerkut, G. A.: The Invertebrata. Cambridge: Cambridge University Press 1961
Bruns, R. R., Palade, G. E.: Studies on blood capillaries. II. Transport of ferritin molecules across the wall of muscle capillaries. J. Cell Biol. 37, 277–299 (1968)
Clementi, F., Palade, G. E.: Intestinal capillaries. I. Permeability to peroxidase and ferritin. J. Cell Biol. 41, 33–58 (1969a)
Clementi, F., Palade, G. E.: Intestinal capillaries. II. Structural effects of EDTA and histamine. J. Cell Biol. 42, 706–714 (1969b)
Cotran, R. S.: The delayed and prolonged vascular leakage in inflammation. II. An electron microscopic study of the vascular response after thermal injury. Amer. J. Path. 46, 589–620 (1965)
Cotran, R. S.: Studies on inflammation. Ultrastructure of the prolonged vascular response induced by Clostridium oedematiensis toxin. Lab. Invest. 17, 39–60 (1967)
Farquhar, M. G., Palade, G. E.: Junctional complexes in various epithelia. J. Cell Biol. 17, 375–412 (1963)
Fawcett, D. W.: The cell. Philadelphia and London: W. B. Saunders Co. 1966
Gansen, P. van: Plexus sanguin du lombricien Eisenia foetida: étude au microscope électronique de ses constituants conjonctif et musculaire. J. Microsc. 1, 363–376 (1962)
Grillo, M. A.: Electron microscopy of sympathetic tissues. Pharmacol. Rev. 18, 387–399 (1966)
Hama, K.: The fine structure of some blood vessels of the earthworm, Eisenia foetida. J. biophys. biochem. Cytol. 7, 717–723 (1960a)
Hama, K.: The fine structure of some invertebrate blood vessels. Anat. Rec. 137, 172 (1960b)
Hand, A. R.: Nerve-acinar cell relationships in the rat parotid gland. J. Cell Biol. 47, 540–543 (1970)
Hand, A. R.: Adrenergic and cholinergic nerve terminals in the rat parotid gland. Electron microscopic observations on permanganate-fixed glands. Anat. Rec. 173, 131–140 (1972)
Hughes, G. M., Grimstone, A. V.: The fine structure of the secondary lamellae of the gills of Gadus pollachius. Quart. J. micr. Sci. 106, 343–353 (1965)
Hughes, G. M., Weibel, E. R.: Similarity of supporting tissue in fish gills and the mammalian reticuloendothelium. J. Ultrastruct. Res. 39, 106–114 (1972)
Kagayama, M.: The fine structure of the monkey submandibular gland with a special reference to intra-acinar nerve endings. Amer. J. Anat. 131, 186–196 (1971)
Karnovsky, M. J.: The ultrastructural basis of capillary permeability studied with peroxidase as a tracer. J. Cell Biol. 35, 213–236 (1967)
Langer, K.: Das Gefäß-System der Teichmuschel. I. Abt. Arterielles und kapillares Gefäß-System. Denkschr. ksl. Akad. Wiss. math.-nat. Kl. 1, 157–180 (1854)
Majno, G., Palade, G. E.: Studies on inflammation. I. The effect of histamine and serotonin on vascular permeability: an electron microscopic study. J. biophys. biochem. Cytol. 11, 571–605 (1961)
Moller, P. C., Philpott, C. W.: The circulatory system of Amphioxux (Branchiostoma floridae). I. Morphology of the major vessels of the pharyngeal area. J. Morph. 139, 389–406 (1973a)
Moller, P. C., Philpott, C. W.: The circulatory system of Amphioxus (Branchiostoma floridae). II. Uptake of exogenous proteins by endothelial cells. Z. Zellfosch. 143, 135–141 (1973b)
Nakao, T.: Electron microscopic study of the closed circulatory system of Nereis. Proc. Electron Microscopy Society of America and First Pacific regional Conference on Electron Microscopy. Thirtieth Annual Meeting. Arceneaux, C. J. (ed.), p. 172–173 (1972)
Nakao, T.: An electron microscopic study of the circulatory system in Nereis japonica. J. Morph. 144, 217–236 (1974)
Newstead, J. D.: Fine structure of the respiratory lamellae of teleostean gills. Z. Zellfosch. 79, 396–428 (1967)
Rhodin, J. A. G.: Structure of the gills of the marine fish pollack (Pollachius virens). Anat. Rec. 148, 420 (1964)
Ruskell, G. L.: Vasomotor axons of the lacrimal glands of monkeys and the ultrastructural identification of sympathetic terminals. Z. Zellforsch. 83, 321–333 (1967)
Schulz, H.: Die submikroskopische Morphologie des Kiemenepithels. In: Fourth Int. Cong. Electron Microscopy, Berlin, vol. 2, p. 421–126 (1960)
Schwanecke, H.: Morphologie des Gefäß-Systems von Anodonta cellensis. Z. wiss. Zool. 112, 433–526 (1913)
Scott, B. L., Pease, D. C.: Electron microscopy of the salivary and lacrimal glands of the rat. Amer. J. Anat. 104, 115–140 (1959)
Shackleford, J. M., Wilborn, W. H.: Ultrastructural aspects of cat submandibular glands. J. Morph. 131, 253–276 (1970)
Tandler, B., Ross, L. L.: Observations of nerve terminals in human labial salivary glands. J. Cell Biol. 42, 339–343 (1969)
Wetekampf, F.: Bindegewebe und Histologie der Gefäßbahnen von Anodonta cellensis. Z. wiss. Zool. 112, 433–526 (1915)
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The author is grateful to Mr. Satoru Suzuki and Mr. Mitsuo Saito for their excellent technical assistance.
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Nakao, T. The fine structure and innervation of gill lamellae in Anodonta . Cell Tissue Res. 157, 239–254 (1975). https://doi.org/10.1007/BF00222069
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DOI: https://doi.org/10.1007/BF00222069