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Secretion from the dog's parotid at different time intervals after denervation.

Previous observations suggest that cholinergic secretory fibres reach the dog's parotid gland not only via the auriculo-temporal nerve but also along the internal maxillary artery. 3–5 days after section of both these sets of nerves citric acid applied to the oral mucosa was found to evoke slow secretion only, or none at all. It has been reported, however, that the secretory response elicited reflexly after auriculo-temporal nerve section gradually increases during the days following the operation. The auriculo-temporal nerve was divided unilaterally in one group of dogs, and in another group this operation was combined with section of the nerves on the internal maxillary artery. During the following five weeks the dogs were examined repeatedly. Each time the secretory innervation was studied in two ways: by pouring citric acid into the mouth and by injecting esenne through the salivary duct into the gland. In addition the secretory responses to methacholine were estimated. The results indicate that postoperatively there was first a period in which there wag some increased release of acetylcholine in the gland (a “degeneration phenomenon”); supersensitivity then developed in the secretory cells. In spite of these complications both methods to study the secretory innervation could be used after the first week and onwards to demonstrate the difference in the effectiveness between the two denervation procedures.