PHOTO-OPTICAL OBSERVATIONS ON THE MECHANISM OF DEFECATION IN MAN

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The present study was made to investigate the details of defecation mechanism. The subjects studied were forteen patients who did not suffer from intestinal diseases. For this purpose, 16 mm X ray cinematogram was taken on every patient using barium enema in supine position. A photo-optical measurement was performed on these cinefilms by the use of a film motion analzyer. The results obtained are as follows:<BR>1. The distension of the rectal ampulla by increasing the internal pressure was one of the factors giving rise to awareness of the need to evacuate the rectum.<BR>2. In the left side colon and rectum, obvious movement was not observed before defecation took place. The colon and rectum went down as a whole toward the pelvic space at the time when defecation started. When distension at the ampulla by intraabdominal pressure exceeded the tension of the anal sphincter, defecation started.<BR>3. The transportation of feces in the left side colon was observed during defecation. The main function of the left side colon seems to be storage of feces.
日本平滑筋学会の論文