I ! ! I I J J I 1 



The anterior portion of 1 

 concealed by the tympani< 



The tympanic : 

 which becom< ndaril) 



born by ;i simple ring or> i 



sterior, and inferior walls ■ : th< 

 wall of the tympanic cavil 



A pro • the tegmen tyn 



and tympanic r> illy. 1 



petrosquan 



which ui m the . 



arated from the mastoid portion by tl 

 of the mastoid i anali 



At ■ 



: 

 At ti.t 



ind, fur- 

 the upper wall 



THE MOST IMPORTANT CANALS OF THE TEMPORAL B< I 



In the temporal bone there is 

 ssels and nen ther. The most importa] 



The facial canal (Fig. 61 I contains, in additi 

 the facial, which gives off two branches dui 

 divided into three portions, which are plai 

 that the canal is bent upon itself in l 

 horizontal, the last one is vertical. 



The first portion of the canal r. m the i 



and then-fore almost at right ai 

 at the hiatusj and lies aim. si try in the . 

 .panes labyrinlhica), above the so-calk I 

 bends vertically downward (at the 

 the stylomastoid foramei . Just befoi 

 which passes obliquely upward and forward ; 

 die facial nerve known as the chorda tympani, which ti 

 cavity through the petrotympani 



;" their relation to thi 



the petrous portion will ! 



t The petrol 



rate foramina. 



X The bend of the canal in this situ 





