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KMID : 0364219880310020122
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Korean Journal of Zoology
1988 Volume.31 No. 2 p.122 ~ p.132
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Ultrastructural Observations on the Cutaneous Granular Glands and Excretory Granule Formation in the Water Toad, Bufo steinegeri Schmidt
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Moon Myung-Jin
Do Kum-Ryung
Kim Chang-Hwan
Kim Woo-Kab
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Abstract
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Ultrastructure of the cutaneous granular glands and production of their secretory granules in the water toad, Bufo steinegeri Schmidt, are studied with light and electron microscopes. Cutaneous granular glands of the water toad have gland cavity in dermis and gland duct in epidermis. Each gland cavity of the granular glands is consisted of 3 types of cells which are inner glandular epithelial cells, outermost myoepithelial cells and another kind of epithelial cells near the gland duct. Characteristically, cytoplasms of the glandular epitelial cells appeared multinucleated masses without differentiation into cells. Poisonous secretory graules excreated by the merocrine secretion are basicafly composed of 2 kinds of granules which are electron dense granules and electron lucent granules. These granules are fused each other and forming compounded structures. According to the granular size and differentiated levels, they are subdivided into 4 types of granules. Synthesis of these secretory granules is occurred at the smooth endoplasmic reticulums of the glandular epithelial cells and limiting membranes of these granules are also originated from these cell organelles.
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KEYWORD
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Cutaneous granular glands , Water toad
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