Submicroscopic changes of the parotid gland caused by functional rest and secretory nerve stimulation
The changes produced in the salivary gland from secretion process have been studied by many. Classical are Heidenhain (1) and Langley (2) researches. With the high resolving power of the electron microscope it is possible to look for better the course of the secretory process. The researches in this branch are few: Gautier and Diomede-Fresa (3), studying the rat submaxillary found an increase of the ergastoplasm after injection of pilocarpine. I am studying with the electron microscope the changes occurring in the lamb parotid gland during the secretory activity induced by electric stimulation of the parasympathetic nerves (4), comparing with the aspect of normal or excretory-duct-ligated gland: it was observed that the excretory duct ligature of the salivary glands leads to true rest condition (5), because the glands are continuously secreting.
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