An experimental study of the rhythmic contractions in the small intestine of the dog
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Exteriorized loops were prepared at various levels in the small bowel of trained dogs and the occurrence and rate of rhythmic contractions noted. Rhythmic contractions were found to be a relatively rare form of movement in these preparations, occurring in about 2 per cent of all tracings. The remaining 98 per cent of the tracings was occupied by irregular types of segmentation, peristaltic and tonus waves.
The rate of rhythmic contractions was a constant for any given loop with a variation of plus or minus one contraction per minute.
The rate of any given loop was found to be a function of its distance from the pylorus, the loop at the highest level having the highest rate, that at the lowest level having the lowest rate.
The rate was not affected by fasting, feeding or sleep, except that in the recently fed animal, rhythmic contractions were less commonly observed than in the fasting animal.
The rate was unaffected by degenerative vagal and splanchnic section.
KeywordsSmall Bowel Myenteric Plexus Brilliant Green Peristaltic Wave Rhythmic Contraction
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