子牛漿膜上皮表面の微絨毛の走査電子顕微鏡による観察

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  • Scanning Electron Microscopic Observations of Serosal Surfaces of the Internal Organs in the Calf
  • コウシ ショウ マク ジョウヒ ヒョウメン ノ ビ ジュウモウ ノ ソウサ デ

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The serosal (mesothelial) surfaces of major organs in body cavities of the calf were examined by the scanning electron microscope. The serosal surfaces were covered with a large number of microvilli which varied considerably in their lengths ranging from 0.2 to 2.5μm. There were differences in density of microvilli among different organs. The numbers of microvilli on the serosal surfaces of abomasum, colon, spleen, peritoneum and mesentery were 59.5-80/10μm2 and these microvili were generally 0.2-1.5μm in length except for those of the peritoneum. The numbers of microvilli of reticulum, omasum, duodenum, rectum, gall bladder, urinary bladder, lung, testis and epididymis were 80-110/10μm2 and these microvilli varied from 0.2 to 2.5μm in length. To the contrary, the numbers of microvilli of rumen, jejuno-ileum, caecum, liver, diaphragm and heart were 110-127/10μm2 and these microvilli were 1.5-2.5μm. The present observations showed that the distribution of microvilli is most dense and microvilli are long in organs which move about most actively in the body cavities such as heart, jejuno-ileum and diaphragm or in large organs such as rumen, caecum and liver. As proposed previously for the function of serosal microvilli in the rat, it is suggested that the serosal microvilli of organs in a body cavity of the calf may protect the serosal surface from the frictional damage arising from the movement of internal organs over one another.

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