直腸肛門管の壁内リンパ管の微細分布について

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  • 5. Fine Distribution of Intramural Lymph Vessels of the Rectum and Anal Canal

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The fine distribution of the intra-mural lymphatic vessels of the rectum and anal canal was investigated, besides the conventional method of puncture injection of dye fluid, by a new method to visualize the lymphatics with inttraarterial injection of AgNO3 mixed with India ink and moreover, by a method to detect the lymphatics with EM and the obtained results are as follows.<BR>(1) All the submucous lymph vessels above the level of ca 2 mm below the mucocutaneous junction have valves which are directed upwards.<BR>(2)It is believed in general that the mucocutaneous junction is the dentate line. But according to the author's histological studies the mucocutaneous junction does not correspond to the dentate line.<BR>(3)It is said that injections of dye fluid above the dentate line do not descend below this line and injections into the wall of the pecten are limited sharply at the dentate line. However, according to the author's investigations, injections of dye fluid into the pecten fill the lymphatics freely across the dentate line, while injections above this line fill the lymphatics of the pecten to a limited extent. The author made clear this phenomena from the histological point of view.<BR>(4)Electron microscopic observations of the lymph vessels in the rectum and anal canal revealed no particular difference in the fine structure from that of the lymphatics in the other parts of the body.

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