PRACTICAL ANATOMY. 



panum ; the bone separating the tympanum from the 

 cranial cavity is very thin and translucent. Internal to 

 this is the hiatus Fallopii, which transmits the large 

 petrosal nerve. A smaller opening frequently exists for 

 the transmission of the smaller petrosal nerve, another 

 branch of the facial. Near the apex is a depression, 

 about the size of a lentil, which accommodates the gan- 

 glion of Gasser. The bone at the apex is slightly 



Camhfirlv.llaeliitt-n tlltf 



TYLO'PtlAllYNOCOS 



Vprniny of carotid, annul 

 Canalfir Jttccbton't nervt 

 Aqurt(iir.r.ui Can/ilaa 

 Canal far AmoU't nerve 

 Ji'yttfar folia 

 Vagi-na-J. proceit 

 Stylmd fraeet 

 J}tiflo?masraul fornmtn 

 Jtiyntar Surface 

 Auricular fissure 



FIG. 10. LEFT TEMPORAL BONE, INFERIOR SURFACE OF THE 

 PETROUS PORTION. 



notched, to accommodate the internal carotid artery as 

 it curves into the cranial cavity. At the junction of the 

 petrous and squamous portions is the remains of a suture, 

 which marks the line of separation between the petrous 

 and squamous portions. The posterior surface forms a 

 steeper incline than the anterior, and presents for 

 examination the internal auditory meatus, which is placed 

 about the centre. This canal is about three lines in 



