ORAL PROPAGATION OF THE CIRCULAR MUSCLE CONTRACTION INDUCED BY LOCAL DISTENSION OF THE ISOLATED GUINEA PIG ILEUM
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The local distension of the intestinal wall was carried out by inflating a thin rubber balloon which had been fixed in the lumen and the contractions of the circular muscle were recorded at the points of 5mm (Po<SUB>1</SUB>) and 20mm (Po<SUB>2</SUB>) oral to the fixed balloon. The contractions elicited by local distension was blocked by tetrodotoxin and atropine, or removing longitudinal muscle, with the myenteric plexus adhering to it, from the intestine at the distending region. When 2 to 3mm length of longitudinal muscle was stripped off around the intestine between Po<SUB>1</SUB> and Po<SUB>2</SUB>, the contraction initiated at Po<SUB>1</SUB> never reached to Po<SUB>2</SUB>. That is, the oral contraction did not propagate beyond the myenteric plexus-free region of the segment. When drugs were applied exclusively to the region around Po<SUB>2</SUB>, tetrodotoxin and hexamethonium, but not atropine, abolished the contraction at Po<SUB>2</SUB>, while the contraction at Po<SUB>1</SUB> was clearly observed. It is likely that the contraction observed at the point of Po<SUB>2</SUB> was evoked by non-cholinergic nervous mechanisms.
- 日本平滑筋学会の論文
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- ORAL PROPAGATION OF THE CIRCULAR MUSCLE CONTRACTION INDUCED BY LOCAL DISTENSION OF THE ISOLATED GUINEA PIG ILEUM