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. 1972 Apr;222(2):407–418. doi: 10.1113/jphysiol.1972.sp009805

Effects of stimulation of efferent fibres of the vagus on the reticulo-omasal orifice of the sheep

J C Newhook, D A Titchen
PMCID: PMC1331389  PMID: 5033471

Abstract

1. The reticulo-omasal orifice has been observed and its activity recorded in decerebrate and spinal preparations of lambs and in lambs and sheep anaesthetized with chloralose.

2. Spontaneous closure movements at about 6/min were seen, or recorded from balloons placed in the orifice in all types of preparation when both vagus nerves had been cut and after atropine, hexamethonium, phentolamine and propranolol had been given I.V.

3. The effects on the reticulo-omasal orifice of stimulation in the neck of efferent fibres of the vagus nerves on either side differed according to the form of the stimulus applied.

4. Threshold stimulation of the vagus nerve caused closing of the orifice which was blocked by atropine.

5. Opening of the orifice and disappearance of spontaneous closing movements followed more intense stimulation of the vagus nerves.

6. Vagal opening effects were obtained after atropine was given and after adrenergic opening and closure effects had been blocked with phentolamine and propranolol.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. BALCH C. C., KELLY A., HEIM G. Factors affecting the utilization of food by dairy cows. 4. The action of the reticulo-omasal orifice. Br J Nutr. 1951;5(2):207–216. doi: 10.1079/bjn19510026. [DOI] [PubMed] [Google Scholar]
  2. BRUNAUD M., DUSSARDIER M. Recherches sur le médiateur chimique du nerf pneumogastrique des ruminants. J Physiol (Paris) 1951;43(2):281–302. [PubMed] [Google Scholar]
  3. COMLINE R. S., TITCHEN D. A. Reflex contraction of the oesophageal groove in young ruminants. J Physiol. 1951 Oct 29;115(2):210–226. doi: 10.1113/jphysiol.1951.sp004666. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Campbell G. Nerve-mediated excitation of the taenia of the guinea-pig caecum. J Physiol. 1966 Jul;185(1):148–159. doi: 10.1113/jphysiol.1966.sp007977. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. DUNCAN D. L. The effects of vagotomy and splanchnotomy on gastric motility in the sheep. J Physiol. 1953 Feb 27;119(2-3):157–169. doi: 10.1113/jphysiol.1953.sp004836. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. IGGO A. Central nervous control of gastric movements in sheep and goats. J Physiol. 1956 Jan 27;131(1):248–256. doi: 10.1113/jphysiol.1956.sp005460. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Iggo A., Leek B. F. An electrophysiological study of single vagal efferent units associated with gastric movements in sheep. J Physiol. 1967 Jul;191(1):177–204. doi: 10.1113/jphysiol.1967.sp008244. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Laplace J. P. Omaso-abomasal motility and feeding behavior in sheep: a new concept. Physiol Behav. 1970 Jan;5(1):61–65. doi: 10.1016/0031-9384(70)90014-4. [DOI] [PubMed] [Google Scholar]
  9. Leek B. F. Reticulo-ruminal mechanoreceptors in sheep. J Physiol. 1969 Jun;202(3):585–609. doi: 10.1113/jphysiol.1969.sp008829. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Martinson J. Vagal relaxation of the stomach. Experimental re-investigation of the concept of the transmission mechanism. Acta Physiol Scand. 1965 Aug;64(4):453–462. doi: 10.1111/j.1748-1716.1965.tb04204.x. [DOI] [PubMed] [Google Scholar]
  11. Oga A., Ota Y., Nakazato Y. The movement of the stomach of sheep with special reference to the omasal movement. Nihon Juigaku Zasshi. 1965 Jun;27(3):151–160. doi: 10.1292/jvms1939.27.151. [DOI] [PubMed] [Google Scholar]
  12. Reid C. S., Titchen D. A. Reflex stimulation of movements of the rumen in decerebrate sheep. J Physiol. 1965 Nov;181(2):432–448. doi: 10.1113/jphysiol.1965.sp007771. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Ruckebusch Y. The electrical activity of the digestive tract of the sheep as an indication of the mechanical events in various regions. J Physiol. 1970 Nov;210(4):857–882. doi: 10.1113/jphysiol.1970.sp009246. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. SETEKLEIV J. UTERINE MOTILITY OF THE ESTROGENIZED RABBIT.I. ISOTONIC AND ISOMETRIC RECORDING IN VIVO. INFLUENCE OF ANESTHESIA AND TEMPERATURE. Acta Physiol Scand. 1964 Sep-Oct;62:68–78. doi: 10.1111/j.1748-1716.1964.tb03953.x. [DOI] [PubMed] [Google Scholar]
  15. STEVENS C. E., SELLERS A. F., SPURRELL F. A. Function of the bovine omasum in ingesta transfer. Am J Physiol. 1960 Feb;198:449–455. doi: 10.1152/ajplegacy.1960.198.2.449. [DOI] [PubMed] [Google Scholar]
  16. TITCHEN D. A. Reflex stimulation and inhibition of reticulum contractions in the ruminant stomach. J Physiol. 1958 Apr 3;141(1):1–21. doi: 10.1113/jphysiol.1958.sp005950. [DOI] [PMC free article] [PubMed] [Google Scholar]
  17. Titchen T. A., Newhook J. C. Adrenergic effector mechanisms in the stomach of the sheep. J Pharm Pharmacol. 1968 Dec;20(12):947–948. doi: 10.1111/j.2042-7158.1968.tb09679.x. [DOI] [PubMed] [Google Scholar]

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