Ultrastructural study of the heart and its relationship with the connective tissue sheath of the stomach in Rhynchonella psittacea (Tentaculata, Brachiopoda)

Journal of Morphology
Marina G Martynova, Oleg Y Chaga

Abstract

The fine structure of the heart and connective tissue sheath surrounding the stomach of the brachiopod Rhynchonella psittacea has been studied. The stomach wall is lined externally with peritoneal epithelium. Between the bases of the peritoneal epithelial cells and those of the stomach epithelial cells is an extracellular amorphous matrix. The exterior part of the matrix is occupied by smooth muscle cells and the interior part by fibroblasts. The heart wall shows continuity with the peritoneal epithelium covering the stomach wall and consists of three layers: an outer layer of smooth myoepithelial and epithelial cells, an intermediate thick layer of extracellular matrix, and an inner discontinuous layer of fibroblasts. In myoepithelial cells, nucleated heads protruding freely into the coelom and contractile parts embedded in the extracellular matrix can easily be distinguished. These cells contain no sarcoplasmic reticulum or any elements of a T system. The epithelial cells are non-muscular mononucleated cells scattered among the myoepithelial cells and closely associated with these basally. They possess a well-developed rough endoplasmic reticulum. In rare cases, a small amount of myofibrils occurs basally in the epithelial ce...Continue Reading

References

Nov 7, 1975·Cell and Tissue Research·H Jensen, R Myklebust
Jan 1, 1980·Cell and Tissue Research·S L Gardiner, R M Rieger
Dec 1, 1994·Cell and Tissue Research·K Kon, T Fujiwara
Jul 1, 1960·The Journal of Biophysical and Biochemical Cytology·K HAMA
Jun 1, 1996·The Biological Bulletin·M G Martynova, A Nylund

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Citations

Jan 7, 2011·Journal of Morphology·Tatyana V Kuzmina, Vladimir V Malakhov

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