NERVE-MECHANISM OF SALIVARY SECRETION. 133 



The sympathetic branches for the submaxillary and sublingual 

 gland come from the plexus which embraces the facial artery, 

 those for the parotid come from the plexus surrounding the in- 

 ternal maxillary as that artery traverses the gland. Both of 

 these nervous plexuses are derived from the superior cervical part 

 of the sympathetic nerve. 



FIG. 65. 



S.C.G. 





Diagram of Nerves supplying the Parotid Gland. The dark lines indi- 

 cate the course of the nerves of the gland. (v.) Inferior division of fifth 

 nerve and its (A T) auriculo-temporal branch, (vn.) Portio dura. (s. c. G.) 

 Superior cervical ganglion sending a branch to the carotid plexus around 

 the artery. 



The cerebro-spiual fibres for the submaxillary and sublingual 

 glands lie in the complex nerve known as the chorda-tympani, 

 which comes from the portio dura of the seventh, and joins the 

 lingual branch of the fifth. They pass thence through the sub- 

 maxillary ganglion to the glands. 



