THE INFLUENCE OF SECTION OF THE CERVICAL SYMPATHETIC NERVE AND EXTIRPATION OF THE SUPERIOR CERVICAL GANGLION ON THE COMPOSITION OF THE PAROTID SALIVA IN THE DOG

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Abstract
The 4-phase experiments, described in an earlier paper (relation of an arbitrary time interval to secretion), are developed in the present one. Records are given of the differences in amounts of saliva secreted and the percentages of organic matter, ash and chlorid in the various salivas obtained from activated glands of dogs. Injection of atropin reduced the amount of saliva secreted but "no definite variation was observed in the relation ship between the organic and inorganic fractions after severing the vago-sympathetic nerve." When the superior cervical sympathetic ganglion is extirpated and a salivary flow produced, either by subcutaneous injection of pilocarpine (2.5 to 3 mgm.) or by stimulation of the oral mucosa with food or 0.25% HCl, the volume of secretion is greater by 2 or 3 cc. than that obtained before extirpation or after section of the vago-sympathetic nerve. Higher concentrations of organic material observed in phase 1 B and 2 are attributed to the varying state of excitation of the salivary center rather than to any variation in tonus of blood vessels. The observations of Henri and Malloizel and those of Babkin upon the effects following extirpation of the superior cervical ganglion are confirmed. When the flow of blood through the parotid gland is increased there results an "optimum nutrition" (?) of the secretory elements.

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