542 



CRANIAL NERVES. 



The Chorda tympam is given off from the facial as it passes vertically down- 

 wards at the back of the tympanum, about a quarter of an inch before its exit 

 from, the stylo-mastoid foramen. It ascends from below upwards in a distinct 

 canal, parallel with the aquaeductus Fallopii, and enters the cavity of the tym- 

 panum through an opening between the base of the pyramid and the attachment 

 of the membrana tympani, and becomes invested with mucous membrane. It 

 passes forwards through the cavity of the tympanum, between the handle of the 

 malleus and vertical ramus of the incus, to its anterior inferior angle, and emerges 

 from ' that cavity through a foramen (the canal of Huguier) at the inner side of 



Fig. 278. The Nerves of the Scalp, Face, and Side of the Neck. 



Terminations 

 'upra-trochleatr 

 Infra -IrocTileaP 



of Nasal 



the Glaserian fissure. It then descends between the two Pterygoid muscles, and 

 meets the gustatory nerve at an acute angle, after communicating with which, it 

 accompanies it to the submaxillary gland ; it then joins the submaxillary ganglion, 

 and terminates in the Lingualis muscle. 



The Posterior auricular nerve arises close to the stylo-mastoid foramen, and 

 passes upwards- in front of the mastoid process, where it is joined by a filament 



