Abstract

The role of the innervation in mediating compensatory enlargement of the parotid gland of the rat after partial desalivation was examined. The results of denervation experiments show that full compensatory growth requires both parasympathetic and sympathetic innervation. The presence of the parasympathetic innervation alone results in an increase in the number of cells, but not the size of the cells. The sympathetic innervation alone does not mediate either response. We, therefore, conclude that the two types of innervation have a synergistic action on the parotid to produce the maximal compensatory response, which includes an increase in both number and size of acinar cells.

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