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Reprints from the writings of W.B. Cannon

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Pages: 144

Language: English

Book format: An electronic version of a printed book that can be read on a computer or handheld device designed specifically for this purpose.

Publisher: (6 Mar. 2012)

By: Walter Bradford Cannon (Author)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...thus far suggests that the myenteric reflex does not hold the small intestine in a fixed and rigid mode of action, but may at times be so far in abeyance as to permit waves of constriction to pass in a direction opposite to the normal. This reversal of peristalsis has been seen in the living animal by means of the X-rays. An obstruction was present about 10 cm. beyond the pylorus. The course taken by food passing along the duodenum was carefully traced on transparent paper laid over a fluorescent screen. After the mass which accumulated above the obstruction had been worked over for some time by alternating periods of segmentation and peristalsis, it was suddenly divided, and the proximal portion was moved rapidly back along the course which had been traced, even up to the pylorus. This reversed conveyance of the food was seen repeatedly with perfect clearness.23 Other evidence that antiperis'talsis may occur in the small intestine has been secured by watching directly, some time after operation, the action of a reversed part of the gut. More than three months after operation Kelling thus saw intestinal contents moved towards the colon through a reversed portion by distinct peristaltic waves.24 Similar observations have been reported by Enderlen and Hess, Beer and Eggers, and McClure and Derge.28 And the clinical evidence that in cases of intestinal obstruction continued vomiting of offensive decomposed material occurs after the stomach has been repeatedly washed, can also be interpreted as due to upward-running waves in the intestine. Although, as Mall and others have shown, reversal of a piece of gut is likely to result in the early accumulation of indiges 25 Cannon and Murphy: Annals of surgery, 1906, xliii, p. 524. Conceivably the factor of fatigue, whi...

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