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 (%)

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Electromyograms of abomasum were recorded on eleven female goats (30-40kg in weight) by using the eight bipolar silver electrodes. The electrodes were chronically sutured on the serosa of abornasum: one in the cardia, three in the fundus and four in the pylorus. The results are summarized as follows:
1. In the area of cardia and fundus, the spike burst was repeated irregularly.
2. In the area of pylorus, the single spike followed by spike burst was repeated regularly and it was recognized that this discharge was ensured from the peristaltic movement of the pylorus.
3. It was considered that the origin of the propagatoin of the discharge from this peristaltic movement was in the pylorus and not in the fundus.

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The purpose of this paper is to show the changes of the intestinal motility following the end-to-end anastomosis. Dogs were used as experimental animals. The recordings of spike burst and slow potential were made from the intestinal walls of anastomosed site.
(1) When anastomosis was performed between duodenum and Treiz lig., the gradient of basic electrical rhythm (BER) of intestine remained unchanged.
(2) Anastomosis in the lower level of Treiz lig. induced the marked fall of BER of anal part compared with that of oral part of anastomosis. In this condition, BER of anal part was coincided with that of terminal ileum. This fall of BER in anal part persisted for about two months after the operation.
(3) During the first postoperative week, the marked suppression of spike burst generation was observed in both oral and anal parts, although the suppression was stronger in anal part than oral part.
(4) The increasing of intraluminal pressure was effective to recover from the suppression of spike burst generation.
These findings were suggestive of existence of higher background excitability in oral part of anastomosis in early postoperative days.

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The present study was made to investigate in detail the mechanism of the bileflow into the duodenum in rabbit. The bile flow through the choledochoduodenaljunction was measured with a constant-rate infusion apparatus or with a constant-pressure perfusion apparatus. Pressures in gall-bladder, common bile duct and duodenum were recorded with pressure transducer. The electrical activities were recorded with bipolar electrodes which were implanted in the choledochoduodenal junction (muscle of Oddi) and the anterior wall of duodenum. The results obtained are as follows:
1. The activity of choledochoduodenal junction appears to be affected by the change in duodenal wall muscle tone.
2. The important factors controlling the bile flow are the rhtyhmic movements of both the choledochoduodenal junction and the duodenal wall.
3. The common bile duct plays a role to regulate the pressure of biliary truct.
4. Electrical and mechanical stimulations to gall-bladder were ineffective to cause the relaxing reflex of the muscle of Oddi.
5. The function of gall-bladder is to accumulate the bile and control the pressure of common bile duct.
From these results, it seems unlikely that the choledochoduodenal junction (muscle of Oddi) would be independent of duodenum in rabbit.

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Effects of several enzymes on the slow wave of rabbit jejunum were examined. Nagarse, α-chymotrypsin and pronase which are protease reduced the amplitude of slow wave but did not affect on the frequency. Lipase and lysozyme, which catalyze the hydrolysis of triglyceride and mucopolisaccharide, respectively, had no effect on the amplitude and frequency of slow wave. The contributions of proteins, lipids and hydrocarbons in smooth muscle cell membrane to slow wave were discussed.

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Guinea-pigs, rabbits, cats and rats were used in this experiment and the following conclusion was obtained.
The pars intestinalis of the common bile duct was surrounded by the circular and longitudinal muscle fibers which were ramified from the same layer of the duodenum. There are no specialized or locarized fibers as described by Oddi.
When the intraluminal pressure in the common bile duct overcame the resistance of the pars intestinalis by the contraction of gall-bladder or duodenum, bile was forced to expel into the duodenum, but some amount of bile was pushed back into the common bile duct even into the gallbladder.
Intraluminal pressure in the common bile duct plays a most important role in the bile expelling mechanism.

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