エゾバフンウニ殻の間歩帯体腔上皮の微細構造

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Histological and ultrastructural features of the coelomic epithelium in the interamburacral region in the sea urchin Strongylocentrotus intermedius were examined by light and electron micro-scopy (SEM and TEM). The epithelium showed a mosaic pattern formed by alternation of cell dense and cell sparse areas, both consisting of flagellated epithelial cells. Abundant muscle fibers and nerve fibers were found at the basolateral spaces between the epithelial cells. The coelomic epithelial cells, therefore, constitute a pseudostratified epithelium together with muscle and nerve cells.In the cell dense area, the flagellated cells were compact and cuboidal, provided with a long flagellum surrounded by well developed collar microvilli and multimorphous peripheral microvilli. The cells in the cell sparse area were irregular and flattened in shape and multimorphous micro-villi were less developed. Some spherular cell-like bodies were frequently found attached to the coelomic epithelium especially in the cell sparse areas. Sometimes, a single or a mass of flagellated cells were observed to be jutting out from the epithelial surface into the coelom.The coelomic epithelium seems to be involved in body fluid circulation with the aid of flagella and microvilli, and also in the production of some coelomocytes.
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