202 A MANUAL OF ANATOMY. 



ward through the cavernous sinus to the sphenoidal fissure, 

 through which it passes. See pages 43, 46, 57. 



(The deep origin of the nerve is from a nucleus in the 

 floor of the fourth ventricle.) 



7. The Facial Nerve. Figs. 29, 53, 10, 1 1, 12. 



The facial arises from the groove between the pons and 

 the medulla at the outer side of the olivary body. The 

 nerve enters the internal auditory meatus with the eighth 

 nerve, traverses the Fallopian canal, and emerges at the 

 base of the skull through the stylomastoid foramen. See 

 page 61. 



Shortly after entering the canal the nerve is slightly 

 thickened ; this is called the geniculate ganglion. From 

 this ganglion are given off the greater, lesser, and external 

 superficial petrosal nerves. 



The great superficial petrosal nerve passes through 

 the hiatus Fallopii and then runs forward and inward to 

 the foramen lacerum medium, pierces the cartilage which 

 fills in this opening, joins the deep petrosal nerve, and 

 forms the Vidian nerve. See page 151. 



The lesser superficial petrosal nerve passes through a 

 small opening external to the hiatus Fallopii, runs forward 

 and inward, and leaves the skull through the foramen 

 ovale to terminate in the otic ganglion. Seepage 1 19. 



The external superficial petrosal nerve traverses a 

 minute hole external to the above-mentioned foramina and 

 terminates in the sympathetic plexus on the middle menin- 

 geal artery. 



Below the geniculate ganglion the facial nerve gives off 

 the following minute twigs : one to the stapedius muscle, 

 another communicating with the pneumogastric, and a 

 larger branch the chorda tympani which courses 



