912 



THE EXTERNAL SECRETIONS 



from the system of the glossopharyngeal nerve, and that of the sub- 

 maxillary from the system of the facial nerve. In the first instance, 

 these fibers become recognizable in the tympanic branch of the glos- 

 sopharyngeus which is known as the nerve of Jacobson. From here 



\Infenor7ftaxiltan 



Otic . 

 \ | Ganglion. 



S/naJl superficial 

 Pftrosai nerve 



FIG. 491. SCHEMATIC REPRESENTATION OF THE COURSE OF THE CEREBRAL FIBERS TO THE 



PAROTID GLAND. (Howell.) 



they reach the otic ganglion by way of the small superficial petrosal 

 nerve. Upon their emergence from this autonomic outpost, they 

 attain the parotid gland by following the highway of the auriculo- 



Sub-fHajfilta.rif-anf J Ganfiion- 



FIG. 492. SCHEMATIC REPRESENTATION OF THE COURSE OF THE CHORDA TYMPANI NERVE 



TO THE SUBMAXILLARY GLAND. (Howell.) 



temporal branch of the inferior maxillary division of the fifth cranial 

 nerve (Fig. 491). The cerebral fibers of the submaxillary gland leave 

 the facial system in the form of a small nerve, known as the chorda 

 tympani. After their emergence from the tympanic cavity through 



