[Response types of the stomach movement induced by diencephalic stimulation (author's transl)]

The stomach movements were detected using strain gauges from chloralose-urethane anesthetized rabbits. The gauges were fixed on the serosal surface of the fundic part a week before each experiment. The intensity, frequency, or pulse width of the stimuli exercised little influence basically on the response patterns; thus, 40-Hz continuous pulses were delivered to the diencephalon. A total of 110 out of 259 stimulating points in the diencephala affected either the rhythmic movement (RM) or the fundamental muscle tone (FT) of the stomach. Five main types of response patterns were recognized: (1) facilitatory responses showing an increase in amplitude and frequency of RM, (2) inhibitory responses showing a decrease in amplitude and frequency of RM, (3) an elevation of FT, (4) a descent of FT, and (5) after-effect type only exhibiting a significant response after the turn-off of a given stimulus. An attempt was made to correspond each of the stomach responses to the anatomical location of the responsive points. The corresponding points were distributed throughout the hypothalamic area. The functional localization was indistinct except of the anterior region of the hypothalamus which was more responsible for the facilitatory effect.