Stowell.] It) ^ [Nov, 5. 



arteriole, and terminates upon the thin muscle (anti-tragicus?) at the base 

 of the ear centrad of the folds which extend from the external meatus to 

 the marginal "pocket" of the ectal ear. 



SUMMARY. 

 Anatomical. 



Proximate Roots. — The dorsal root proceeds from the cerebellum 

 with the medipeduncle. 



The cephalic root has one ental origin in the region of the floor of the 

 epicoele or the post-optici part of the mesocojle, and another in the cere- 

 bellum, whence it proceeds with the prepeduncle. 



The caudal root originates in the caudal portion of the floor of the 

 metaccele. 



Ectal Origin. — This is from the latero-cephalic border of tlie trape- 

 zium ; it is separated by an arteriole and a venule from the auditory- 

 nerve. 



The Exit is by the meatus auditorius entalis, dorsad of the auditory 

 nerve, through the aqueductus fallopii, and emerges from the foramen 

 stylo-mastoideum. 



Principal Ectocranial Divisions and their Distribution. — 

 Nervus digastricus is distributed to the musculus digastricus ; N. stylo- 

 hyoideus to M. stylo-hyoideus ; N. cervico-facialis to the MM. platysma, 

 orbicularis oris ventralis, depressor labii ventral is, depressor anguli oris, 

 risorius ; N. temporo-facialis to the MM. orbicularis oris dorsalis, buc- 

 cinator, zygomatici, levatores labii dorsalis, orbicularis palpebral, occipito- 

 frontalis, attrahens aurem ; N. auricularis to the MM. occipito-frontalis, 

 retrahens aurem, helicis major, helicis minor, antitragicus. 



Communicating Rami. 



Ento-cranial. — The facial nerve receives an accession just peripherad ot 

 the arteriole which separates it from the auditory ; this is probably the 

 intermediary nerve of Wrisberj^ or the root of the chorda-tympani (Sapo- 

 lini's thirteenth cranial nerve). 



Inter-cranial. — The facial nerve communicates with the spheno-palatine 

 ganglion by the great superficial petrosal root of the vidian nerve ; with 

 the otic ganglion by the small superficial petrosal nerve ; with the sympa- 

 thetic plexus by the lateral petrosal nerve ; with the Gasserian ganglion 

 of the trigeminus by an anastomotic filament from the ramus at the angle 

 in the aqueduct ; with the petrosal ganglion of the glosso-pharyngeal by 

 a large fascicle from the geniculate ganglion ; with the jugular ganglion 

 of the vagus by the same fascicle ; with the lingual branch of the trigemi- 

 nus by the chorda tympani ; with the stapedius muscle by the tympanic 

 nerve ; with the tensor tympani by filaments from the small superficial 

 petrosal nerve. 



Ecio-cranial. — The facial nerve communicates with the superficial cer- 

 vical nerve by the infra-maxillary branch ; with the mental nerve (man- 

 dibular division of the trigeminus) by the infra-maxillary ; with the 



