OSTEOLOGY. 



81 



Cttnahfur^EutlaeTiian tnl* 

 W Tcntorfymixinimufcle 



Rcujh Quadrilateral Surface 



Vprntntjr of earvtii} oaiial 



Ca.mil far Jacobfon* nerve 



Aqusdn<:r.u.s Car/tie a. 



CanaL for Arnold't nerve 



ITYLO-PfAftrNOe03 



Vaginal process 



Stylaid process 



-mastAul, foramen 



Jiigtilnr Surface 



Auricular fiasurc. 



FIG. 38. 

 Left temporal bone, inferior surface of the petrous portion. 



FIG. 39. 



Section of the temporal bone (natural size) through the middle 

 ear, Fallopian canal, mastoid antrum, and cells, showing dense bone 

 between the antrum and cells, with no communication between them: 

 1, drumhead; 2, tip of the mallet handle; 3, anvil, showing the long 

 crus at the right for articulation with the stirrup, and the short proc- 

 ess at the left which serves the purpose of an anchor to the bone; 4, 

 head of the mallet; 5, tensor-tympani muscle and tendon; 6, dense 

 bone where pneumatic spaces are usually found; 7, pneumatic colls in 

 the tip of the mastoid process; 8, Fallopian canal, for the facial nerve; 

 9, the stirrup. At the right of 9 and at the left of the anvil is the 

 aditus ad antrum, connecting the tympanum with the antrum. 



