Nervous regulation of abomasum motor activity in sheep.
Pharmacological studies of abomasum motor activity were carried out in 3 sheep with chronic fistulae in the rumen and the fundus and pyloric part of the abomasum. The contractions of these parts of the stomach were recorded by the balloon method. The obtained results showed that in the abomasum stimulation of alpha-adrenergic receptors raises the degree of motor activity while stimulation of beta-adrenergic receptors inhibits it. It has been shown also that the sympathetic system has a greater influence through the beta-adrenergic receptors on the motor activity of the pyloric part than on that of the fundus of the abomasum. The analysis of the records obtained after bilateral vagotomy demonstrated that the automatism of the pyloric part was greater than that of the fundus of the abomasum.
D000018:Abomasum / Q000294:innervation*; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects; D010656:Phenylephrine / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology; D011942:Receptors, Adrenergic, alpha / Q000502:physiology; D011943:Receptors, Adrenergic, beta / Q000502:physiology; D012756:Sheep / Q000502:physiology*; D013564:Sympathetic Nervous System / Q000502:physiology*; D014628:Vagotomy
D011942:Receptors, Adrenergic, alpha; D011943:Receptors, Adrenergic, beta; D010656:Phenylephrine; D001285:Atropine; D011433:Propranolol; D007545:Isoproterenol