The receptive relaxation of the stomach / by W.B. Cannon and C.W. Lieb.

  • Walter Bradford Cannon
Date:
[1911?]
Catalogue details

Licence: Public Domain Mark

Credit: The receptive relaxation of the stomach / by W.B. Cannon and C.W. Lieb. Source: Wellcome Collection.

    7/12 page 271
    and the relaxation of the gastric wall may be so great that as much as 8 or 10 c.c. of new contents may be received without much increase in the work of cesophageal muscles. This is an admirable instance, in the autonomic system, of the unidirectional working of the law of reciprocal innervation of antagonistic muscles. As in the cardia, so in the stomach, repeated swallowing causes con- [ tinued relaxation. Fig. His a. record. of: the wy persistent inhibition of y gastric tonus resulting | from repeated swallow- . ing of bits of meat. When the animal be- came excited, the stom- ach was inhibited as a concomitant of the emo- tional condition, but re- covery of the former REP Ge | state of tone was slower | A SO a woe than recovery from the Ficure 3. — Gastric relaxation after deglutition with inhibition which follows right vagus cut (A), the moment of cutting the left vagus (B), and the failure of relaxation with both vagi cut (C). pa Nadel | EER core pee ae eee en | “ deglutition. In Fig. 2 the sharp changes in the record of gastric volume (above the asterisks) were due to occasional excitement and movement of the animal. The subsequent lessening of tone is notable in each instance. The continued relaxation was probably at some moments in part due to the excitement. The inhibition of gastric contraction which attends an emotional outbreak is due to impulses discharged by way of the splanchnic nerves.® The inhibition which follows deglutition is produced by way of the vagus nerves. This was proved by severing the right vagus nerve below the recurrent laryngeal in an aseptic operation, and later, after securing records of gastric relaxation after deglutition, severing the left vagus in the neck, whereupon the relaxation did not 8 Cannon: American journal of the medical sciences, 1909, Cxxxvii, p. 485.
    digitised image 1
    digitised image 2
    digitised image 3