The Vagal Inhibitory Responses of the Stomach to Stimulation of the Dog'S Higher Brain Stem

摘要

The inhibitory response of the stomach movement through the vagus nerve and the motor response of the stomach through the splanchnic nerve were investigated in the dog's midbrain. The dog was previously transected the spinal cord in the experiment of the vagal inhibitory response, and in the experiment of the splanchnic motor response, the animal was previously transected the bilateral vagus nerves. The stimulated areas were examined histologically. The inhibitory response of the stomach movement was obtained through the vagus nerves. This was abolished after the application of the hexamethonium bromide. A large number of the stimulated areas was located in the formatio reticularis, nn. colliculi inf., lemniscus medialis, tr. sp.-m-thalamicus, substantia grisea cent., substantia nigra, tr. rubrospinalis and so on. The connection between the vagal inhibitory areas in the midbrain and pons and the inhibitory center in the medulla oblongata is discussed. The splanchnic motor response of the stomach movement was induced through the splanchnic nerves, as well as the inhibitory response of the stomach movement. A large number of the stimulated areas was located in the formatio reticularis, nn. cuneiformis, substantia grisea cent., nn. ruber, tr. sp.-m-thalamicus, substantia nigra and so on. The connection between the splanchnic motor areas in the midbrain and pons and the motor center in the medulla oblongata is discussed. (Author)