HEAD. 113 



iaternal auditory hiatus to the aqueduct of Fallopius, 

 through the stjlo-mastoid foramen, then under the 

 parotid, to the posterior border of the maxillary bone, 

 on the external face of the masseter and terminates by 

 the zygomatic plexus. Collateral branches : 1 and 

 2 — the great and small superficial petrosal nerve ; 3 — 

 the nerve of the muscle of the stirrup ; 4: — the nerve 

 of the corda tympanii, all to the internal ear ; 5 — an 

 anastomotic branch to the pneumogastric ; 6 — the 

 nerve of the stylo-hyoideus muscle ; 7 — of the digas- 

 tricus ; 8 — of the great kerato-hyoideus ; 9 — a cervical 

 branch ; 10 — nerves to the guttural pouches and to 

 the parotid gland ; 11 — the three auricular nerves, 

 posterior, middle and anterior. Terminal branches 

 form the sub-zygomatic plexus, over the external sur- 

 face of the masseter muscle and ramifying in the tissue 

 of the cheeks, lips and nostrils. 



8. Auditory or acoustic. — Origin : From the bulb 

 by two branches, one from the restiform bodies, the 

 other from the floor of the fourth ventricle. Course : 

 Passes behind the seventh into the internal auditory 

 hiatus, and divide in two branches, anterior and pos- 

 terior, ramifying into the cochlea, the vestibulum and 

 semicircular canals. 



9. Glosso pharyngeal. — Origin: On the side of 

 the bulb between tlie restiform bodies and the lateral 



