三角帆蚌(Hyriopsis cumingii)是我国主要的育珠母蚌,其所培育出的珍珠色泽鲜艳、细腻光滑,因而成为目前淡水育珠生产中首选的育珠母蚌之一。蚌的外套膜是贝壳和珍珠形成的重要组织器官,有内外两层表皮细胞及其间的结缔组织构成。它对钙具有高度通透性,其上皮细胞具有通过细胞膜主动吸收Ca~(2+)和贮存Ca~(2+)的功能,并通过胞吐作用排出钙至外套膜外腔中,这些钙就是形成珍珠的基础。维 Hyriopsis cumingii is one of the major jellyfish in our country. Its cultured pearls are brightly colored, delicate and smooth, making them one of the preferred jellyfish in the production of freshwater pearls. Clam shell film is the formation of shellfish and pearl important organs, both inside and outside the epidermal cells and connective tissue formation. It is highly permeable to calcium. Its epithelial cells have the function of actively absorbing Ca 2+ and storing Ca 2+ through the cell membrane, and excrete calcium into the outer mantle through exocytosis. These calcium It is the basis for the formation of pearl. dimension