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KMID : 0378019770200110071
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New Medical Journal
1977 Volume.20 No. 11 p.71 ~ p.79
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The Ultrastructure of the Amphibian Epidermis
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金翰華/Kim, Han-Hwa
盧鏞泰/鄭英和/池永得/Nho, Yong-Tai/Chung, Young-Wha/Chi, Yung-Duk
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Abstract
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The authors observed the ultrastructures of the keratinocytes in the epidermis of dorsal skin of the four species in the Korean amphibia: Bombina orientalis; Kaloula borealis, Rana nigromaculata and Rana rugosa. The results were as follows: 1. Amphibian epidermis consisted of 5 or 6 layers of keratinocytes and were divided into four strata: stratum germinativum (1 cell layer), stratum spinosum (1 or 2 cell layers), stratum granulosum (1 or 2 cell layers) and stratum corneum (1 or 2 cell layers) 2. Many microfilaments and secretory mucous granules developed" during cornification of the keratinocytes in the amphibian epidermis without keratohyalin granules developing in the mammalian epidermis. 3. The keratinocytes of the amphibian epidermis were mostly connected with desmosomes. Hemidesmosomes were found between the basal lamina and the basal face of the stratum germinativum and composite desmosomes between the upper face of the stratum granulosum and the basal face of the stratum corneum. The, surface keratinized cells were connected with zonula occludens in the upper portion and with modified desmosomal elements in the lower portion, 4. The keratinocytes of the amphibian epidermis were different in ultrastructure at each stratum. a. In the stratum germinativum, the keratinocytes were columnar or cuboidal in form. Many mitochondria, microfilaments and ribosomes were found in the cytoplasm. b. In the stratum spinosum, the keratinocytes were cuboidal or polygonal in form, Many microfilaments and ribosomes were found and a few granular and agranular endoplasmic reticulum and Golgi complex developed in the cytoplasm. c. In the stratum granulosum, the keratinocytes were squamous in form and the intercellular spaces well developed. Many microfilaments, ribosomes, secretory mucous granules and pigment granules were found in the cytoplasm. d. In the stratum corneum, the keratinocytes were squamous in form and were filled with microfilaments. A few vacuoles and remnants of cell organelles were seen in the cytoplasm.
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