In this study, it was tried that the tonus of the gastric wall were indicated as “stretch rate, ” variables of extention of gastric wall by pouring of various amount of warm water into the stomach of the dog. The effects of truncal vagotomy on the stretch rate were also observed in these dog.
The results were as followed:
1) The stretch rate of the fundus in transverse axis was the biggest, followed by corpus in transverse axis, fundus and corpus in longitudinal axis. In antrum, stretch rate was the smallest. These were almost same in both axes in the antrum. The stretch rate of the fundus were 3.5-8 times of the antrum.
2) No effects of the truncal vagotomy on the stretch rate were observed immediately after operation. The grades of the stretch rate were increased in fundus at transverse axis 2 weeks after vagotomy. In the other portion of the stomach, no changes were observed in stretch rate, 2 weeks after vagotomy. In this study, stretch rate was calculated by following formula.
(length of the gastric wall after pouring-length before pouring) /length before pouring × 100 (%)
