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Parotid salivary flow in 53 patients with chronic otitis media and in 20 normal control subjects was measured pre- and postoperatively. There were no statistically significant differences between the right and left parotids. Neither chronic otitis media nor cholesteatoma disturbed parotid salivary flow. Resection of Jacobson's nerve or the chorda tympani reduced parotid salivary flow. Resection of both nerves doubled the reduction of parotid salivary flow. These results suggest that the chorda tympani affects parotid secretion. The chorda tympani may contain secretory fibers to the parotid gland or autonomic nerve fibers which influence the parotid salivary secretion. However, this assumption is difficult to confirm, partly because of species differences or even differences in a single species of the innervations to the parotid gland. In our study contralateral parotid salivary flow did not reveal significant changes postoperatively. Postoperative reduction of parotid salivary flow was nearly fully restored approximately 9 months after middle ear surgery.

Parotid salivary flow after middle ear surgery.