Effects of Stimulation of the Chords Tympani and Cervical Sympathetics on the Submaxillary Secretion and Intraluminal Pressure of the Submaxillary Duct in Cats

가묘악하선(家猫顎下腺)에 있어서 고색신경(鼓索神經) 및 경부교감신경자극(頸部交感神經刺戟)이 타액분필(唾液分泌) 및 배설관내압(排泄管內壓)에 미치는 영향(影響)

In Nembutal anesthetized cats, the sobmaxillary duct was cannulated with polyethylene tube, and effects of stimulation of the chorda tympani and cervical sympathetics on, the submaxillary secretion and intraluminal pressure of the submaxillary duct were observed. The stimulation of tile chorda tympani elicited a profuse salivary secretion. The stimulation of the cervical sympathetics evoked only a scanty flow, and on repeated stimulation of the nerve salivary flow response gradually diminished and finally the flow ceased. In this state the salivary flow by the sympathetic stimulation was resumed after the stimulation of the chorda tympani. Atropine abolished these responses to nerve stimulation. Intraluminal pressure of the submaxillary duct was abruptly increased and remained on a plateau during the stimulation of the chorda tympani, whereas sympathetic stimulation elicited moderate increase of the intraluminal pressure which did not remain in spite of continued stimulation. These results suggest that scanty salivary flow induced by cervical sympathetic stimulation is not real secretion but simple elimination of the saliva already present in the duct due to contraction of the contractile elements known to exist in the duct wall.