カイウサギ鼻腔粘膜の光学顕微鏡的および走査電子鏡的構造
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概要
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The nasal cavity mucosa of adult domestic rabbits was studied under light microscopy and scanning electron microscopy. The main findings are summarized as follows : 1. Mucosa of the anterior nasal concha and the nasal septum The entire mucosal surface of the respiratory portion is covered by pseudostratified ciliated epithelium. In the scanning electron microscopic picture, an area widely covered by the cilia of ciliated cells and a small area of non-ciliated cells are distinguished. The cell surface of the latter shows some elevation, from which relatively short microvilli grow. These cells probably represent immature or juvenile stages of goblet cells recognized under the light microscope and conventional electron microscope. At each site over the ciliary surface of the ciliated cell, fine particle-like structures are present. This is not merely the adherance of simple foreign bodies but probably represents local elevation of the ciliary membrane in response to some chemical stimuli. 2. Mucosa of the meatus nasopharyngeus Unlike the mucosa in the previous section, the formation of mucous membrane plica is seen. As the pharynx is approached, the height of the plica increases. The distribution of goblet cells contained in the pseudostratified ciliated epithelium becomes denser. The elastic fibers of the lamina propria mucosae are well developed. In the submucosa, the proportion occupied by the glandular layer (G1. palatinae) is greater than that by the muscular layer. No elastic fibers are present in the mucosa of the soft palate. 3. Mucosa of the olfactory portion a) The epithelium consists of olfactory cells, supporting cells and basal cells, as in other animals. In the scanning electron microscopic picture of the area with a yellow-brown macroscopic appearance, numerous chestnut-bur-like structures protrude from the surface, probably representing olfactory vesicles. The size of these structures is variable, without regularity in distribution. Numerous cilia grow from the surface of these structures. In the area without a yellow-browe color, no such chestnut-bur-like structures are noted and only the group of cilia with the tips assembled at the center of the cell surface in each cell unit is noted. b) At each site of the lamina propria mucosa of the olfactory mucosa, lymphoid tissue is present as in the respiratory portion. Most of the epithelial layer covering the lymphoid tissue, however, has frequently fallen off. It is consequently possible to demonstrate a mass of lymphocytes exposed directly on the cavity surface. The outside appearance of the exposed lymphocyte mass is round, with the longest diameter of 300-450μ, surrounded by a group of cilia of the respiratory portion. On the surface of each lymphocyte, long and short microvilli grow.
- 九州歯科学会の論文
- 1978-05-31