J.Jpn. Surg. Soc.. 58(4): 667-676, 1957
STUDIES ON THE DEVELOPMENT OF STOMACH AS A RESERVOIR IN THE LOWER VERTEBRATE (HARD-BONED FISH)
PART 2. STUDY ON THE FUNCTION OF STOMACH AS A RESERVOIR
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2nd Surgical Clinic, Kyushu University School of Medicine (Director: Prof. TOMODA) Bunzi HARA |
It is not distinctive, however, whether this finding should be taken as the demonstration of reservoir function.
The author has gotten the following conclusions as a result of studying the upper problem and the motility and roentgenography of the upper digestive tract (or stomach) of hard-boned fish.
The results obtained are :
1) The distended part of the intenstin, which is continuous to the esophagus in Carassiu auralus or in Misgurnus anguillicaudatus, and the short tubular stomach of Mogurnda obscura contract more slowly than the distal part of the intenstin.
2) The distended intestine of Carassius auratus retains contrast medium for 12 hours on the average, the stomach of Mogurnda obscura for 14 hrs., and the sac-formed stomach of Parasilurus asoturs, which is considered developed type of the stomach, for 23 hrs., Further, in the stomach of Channa argus which has a blind sac the greater part of medium is seen retained after 24 hrs.
3) The stomach becomes distended and sac-formed with the increase of it content, and the terminal portion of the pylorus has function of closure and rhythmical output.
Thus conclusively the author has demonstrated that even in stomach-lacking fish, the upper portion of digestive tract functioned as a resrvoir, thus serving as a substitut stomach, and that in stomach-posessed fish, the reservoir function and the rhythmical output of stomach beome more and more developed.
Finally the author shows the importance of reservoir function of the stomach in organism.
(author's abstract)
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