[On the responses of movements of the distal colon to stimulation of dog's medulla oblongata].

The responses of movements of the distal colon to stimulating dog's medulla oblongata were examined.1. The excitatory response of movements of the distal colon was demonstrated to stimulating medulla oblongata. The excitatory pathways to the colon from the spinal cord were not only the pelvic nerves, but also the sympathetic nerves such as the hypogastric and lumbar colonic nerves.2. The inhibitory response of movements of the distal colon was also demonstrated to stimulating medulla oblongata through the hypogastric and lumbar colonic nerves. The inhibitory response through the pelvic nerves was not observed.3. The excitatory and inhibitory areas in the medulla oblongata were examined histologically (see Fig. 4). The excitatory areas were found in the dorsal and medial region of reticular formation, solitary tract and its nucleus and dorsal nucleus of vagus. These regions also responsible for the inhibitory areas.