66 



THE SKULL AND THE BONES OF THE SKULL 



Mastoid antrum 

 Antrum tympanicum 



Prominence of the external semicircular canal \ 

 Prominentia canalis semicircularis lateralis 

 Prominence of the aqueduct of Fallopius > X X 

 Prominentia canalis lacialis \ 



Fossula of the fenestra ovalis , or fossula ovalis 

 Fossula fenestrae vestibuli 



Cochleariform process 

 Processus cochleanformis 

 Canal for the tensor tympani muscle 

 Semicanalis m. tensoris tympani 

 Septum of the musculotubal canal 



(cochleariform process) 

 Septum canalis musculotubarii 

 Osseous canal for the Eustachian tube 

 Semicanalis tubae auditivae 



Air-cells of the Eustachian tube 

 Cellulae pneumaticae tubariae 

 Tympanic orifice of the Eustachian tube 

 Ostium tympanicum tubas auditivae 



Promontory, or tuber cochleae 

 Promontoruim 



Upper opening of the tympanic canaliculus (for Jacobson's nerve) 

 Apertura superior canaliculi tympanici 



Pyramid, or eminentia 



papillaris 

 Eminentia pyramidalis 



Sinus posterior 



Sinus posterior 



External auditory meatus 

 Meatus acusticus externus 



Tympanomastoid fissure 



Fissura tympanomastoidea 



V, 



External orifice of the canal for Arnold's nerve 



\ Apertura externa canaliculi mastoidei 



Tympanic sinus Sinus tympani 

 Tympanic sulcus Sulcus tympanicus 

 Fossula of the fenestra rotunda, or fossula rotunda 

 Fossula fenestrae cochleae 



FIG. 135. VERTICAL SECTION THROUGH THE LEFT TEMPORAL BONE IN A PLANE PARALLEL 

 WITH THE SUPERIOR BORDER OF THE PETROUS PORTION, AND PASSING THROUGH THE MIDDLE 

 OF THE EXTERNAL AUDITORY MEATUS, TO DEMONSTRATE THE TYMPANIC CAVITY, CAVUM 

 TYMPANI, AND THE ADJOINING PARTS. 



Entrance to mastoid antrum 



Aditus ad antrum tympanicum 



Cochleariform process 

 Processus cochleariformis , 



Hiatus Fallopii 



Hiatus canalis facialisx 



\ 



Canal for the tensor tympani muscle 

 Semicanalis m. tensoris tympani ' 



Septum of the musculotubal canal 



(cochleariform process) 

 Septum canalis musculotubarii 



Osseous canal for the Eustachian tube 

 Semicanalis tubae auditivae 



Tympanic orifice of the Eustachian tube 

 Ostium tympanicum tubae 



Carotid wall of tympanum 

 Paries caroticus 



.Mastoid antrum 

 Antrum tympanicum 



Mastoid wall of tympanum 



Paries mastoideus cavi tympani 



-..External auditory meatus 



Meatus acusticus externus 



"-Tympanic sulcus 

 v - Sulcus tympanicus 



Jugular wall of tympanum 

 \ Paries jugularis cavi tympani 



Inner wall of tympanum 

 Paries labyrinthicus 



FIG. 136. VERTICAL SECTION THROUGH THE LEFT TEMPORAL BONE IN A PLANE PARALLEL 

 WITH THE SUPERIOR BORDER OF THE PETROUS PORTION, THE SECTION PASSING ALONG THE 

 POSTERIOR WALL OF THE EXTERNAL AUDITORY MEATUS, TO DEMONSTRATE THE TYMPANIC 

 CAVITY, CAVUM TYMPANI, AND THE ADJOINING PARTS. 



Os temporale Temporal bone. 



