FACIAL yEJiVE 



r63 



It crosses the menibrana tvnii)ani at the junction of the upper and middle thirds of 

 that membrane. In this part of its course it runs forwards between the fil^rous and 

 mucous layers of the mend>rana tymj)ani, ])assing on the inner side of the manu- 

 brium of the malleus. It leaves the tymj)anum by ])assin<r throu<rh the iter chordje 

 anterius, or canal of HuLMiier. crosses the inner side of the spine of the sj)lienoid in 

 the groove described by Mr. Lucas, and, after connnunicating with the otic gan- 

 glion, passes forwards, under cover of the external ])terygoid muscle, to gain the 

 outer side of the lingual nerve, which it joins at an acute angle. Thence it runs in 

 the sheath of the lingual n(;rve, a })ortion of its fibres, as already descriljed (see 

 Lingual Nerve), passing into the submandibular ganglion. Other fibres reach the 

 sul)lingual gland, and the dorsum of the tongue. 



Fig. 449.— Supeefici.vl DisTHiurTiox of the Facial and othek Nerves of 

 THE Head. (After Hirschfeld and Leveille.) 



SUPRA-ORBITA L 



F.ILPKHRALTWIG 

 OF LACHRYMAL 



ISFKA TROCHLKA R 



TEMPORA L 

 HRAyCII OP 

 SEVES 



MALAR BR. 



OF SEVEXTH 



MAXILLARY 



I)l\: OF FIFTH 



IXFRA- 



ORBITAL 



BR. OF a EVE. 



BrrCAL HRAXr 

 OF ."EtEXr// 



MEXTAL bra: 

 OF MAXDIBCL 



SrPRA-MAXniB 

 BRAXrjI OF 



POSTER 10 R 

 AURICULAR 



A URICULO- 

 TEMPORAL 



GREA T 

 OCCIPITAL 



FACIAL 



LESSER OCCIPITAL 

 GREAT A URICULAR 



SUFERFICIAL 

 CERVICAL 



(/) The communicating twig to the pneumogastric is given of¥ at the same 

 level as the cliorda tyiiipani. and joins the nuricular branch of tlie pneunH)gastric 

 while the latter is traversing the substance of the temporal bone. 



(2) The branches whicli arise from the facial nerve lietween the stylo-mastoid 

 foramen and the terminal bifurcation are the posterior auricular and the nerves to 

 the posterior belly of the di<rastrie and to the .^tylo-hyoid muscles. A lingual l>rancli 

 is also desen])ed. 



(a) The posterior auricular nerve is the first branch of the extracranial por- 

 tion of the facial. It passes Ix'tween the parotid gland and the anterior border of 

 the sterno-mastoid muscle, and runs ui)wards in the deep interval between tlie 



