THE GLOSSO-PHARYNGEAL NERVE. 



259 



over the outer surface of the latter muscle, and passes beneath the hyo-glossus to 

 end in branches for the hinder part of the tongue (fig. 179, 16). 



The jugular ganglion (g. superius) is situated at the upper part of the osseous 

 groove in which the nerve lies during its passage through the jugular foramen. It is 



Fig. 175. DIAGRAMMATIC SKETCH FROM BEHIND OF 



THE ROOTS OF THE NINTH, TKNTH, AND ELEVENTH 

 NERVES, WITH THEIR GANGLIA AND COMMUNICA- 

 TIONS. (Bendz.) 



A, part of the cerebellum above the fourth ven- 

 tricle ; B, medulla oblongata ; C, spinal cord; 1, 

 glosso-pharyngeal nerve ; 2, pneumo-gastric ; 3, 3, 



0, spinal accessory ; 4, jugular ganglion of the 

 glosso-pharyngeal ; 5, petrosal ganglion ; 6, tym- 

 panic branch ; 7, ganglion of the root of the 

 pneumo-gastric ; 8, auricular branch ; 9, ganglion 

 of the trunk of the pneumo-gastric ; 10, branch 

 from the upper ganglion to the petrosal ganglion of 

 the glosso-pharyngeal ; 11, inner portion of the 

 spinal accessory ; 12, outer portion ; 13, pharyngeal 

 branch of the pneumo-gastric ; 14, 14, superior 

 laryngeal branch ; 15, twigs connected with the 

 sympathetic ; 16, internal part of the spinal acces- 

 sory prolonged with the pneumo-gastric. 



from 1 to 2 mm. in length, and it includes 



only the lower filaments of the nerve, the 



upper ones forming a separate fasciculus 



which passes over the ganglion, and joins the trunk of the nerve below it. This 



ganglion is not always to be distinguished, and it is regarded by Henle and others as 



Fig. 176. THE TYMPANIC BRANCH OF THE GLOSSO- 

 PHARYNGEAL NERVE, AND ITS CONNECTIONS. 

 (Breschet.) 



A, squamous part of the left temporal bone ; B, 

 petrous part ; C, inferior maxillary nerve ; D, 

 internal carotid artery ; a, tensor tympani muscle : 



1, sympathetic plexus ; 2, otic ganglion ; 3, glosso- 

 pharyngeal nerve ; 4, tympanic nerve ; 5, 5, caro- 

 tico-tympanic twigs ; 6, twig to fenestra rotunda ; 

 7, twig to fenestra ovalis ; 8, junction with the 

 facial nerve ; 9, small superficial petrosal nerve ; 

 10, twig from the otic ganglion to the tensor tym- 

 pani muscle ; 11, facial nerve ; 12, chorda tympani ; 

 13, petrosal ganglion of the glosso-pharyngeal ; 14, 

 small deep petrosal nerve. 



resulting, when present, from the more or 

 less complete separation of a part of the 

 petrosal ganglion. 



The petrosal ganglion is contained 

 in a small depression at the lower end of 

 the groove in the petrous part of the 



temporal bone, and measures from 4 to 5 mm. in length. From it arise the small 

 branches by which the glosso-pharyngeal is connected with other nerves at the base 

 of the skull ; these are the tympanic nerve, and the branches of communication 

 with the pneumo-gastric and sympathetic. 



BRANCHES. A. Connecting branches and tympanic branch. 



One filament unites the petrosal ganglion of the glosso-pharyngeal nerve with 

 the upper cervical ganglion of the sympathetic ; a second passes to the auricular 



