THE SKULL AND THE BONES OF THE SKULL 



67 



Deficiency in the tympanic wall of the aqueduct of Fallopius (variety) 



Fenestra ovalis Fenestra vestibuli 

 Fenestra rotunda Fenestra cochleae 



Promontory Promontorium 

 Hiatus Fallopii Hiatus canalis facialis 



Canal for the tensor tympani muscle 

 Semicanalis m. tens, tympani 

 Septum of the musculotubal canal 



(cochleariform process) 

 Septum canalis musculotubarii 

 Groove for the Gasserian ganglion .... 

 Impressio trigemini 



Carotid canal Canalis caroticus 

 Osseous canal for the Eustachian tube 

 Semicanalis tubae auditivse 



Caroticotympauic canaliculi 

 Canaliculi caroticotympanici 



Tympanic cells 

 Cellulae tympanicae 

 Canaliculus for the chorda tympani nerve 



(iter chordse posterius) ... 

 .Canaliculus chordae tympani 



Prominence of the external semicircular canal 



Prominentia canalis semicircularis lateralis 

 ; Entrance to mastoid antrum Aditus ad antrum tympanicum 



Ponticulus promontorii Ponticulus promontorii 

 Mastoid antrum Antrum tympanicum 

 Tympanic sinus Sinus tympani 



Sinus posterior 



Sinus posterior 



:_i__-Mastoid cells 

 ---"Cellulae mastoideae 



Mastoid process 

 Processus mastoideus 



Aqueduct of Fallopius 



/ Canalis facialis 



Stylomastoid foramen 



Foramen stylomastoideum 



FIG. 137. VERTICAL SECTION THROUGH THE LEFT TEMPORAL BONE, CROSSING OBLIQUELY THE 

 SUPERIOR BORDER OF THE PETROUS PORTION, AND PASSING THROUGH THE ANTERIOR PORTION 

 OF THE MASTOID PROCESS, TO DEMONSTRATE THE TYMPANIC CAVITY, CAVUM TYMPANI, AND 

 THE ADJOINING PARTS (ESPECIALLY THE MASTOID ANTRUM AND THE MASTOID CELLS). 



Ponticulus promontorii 

 t Ponticulus promontorii 

 j External semicircular canal 



Canalis semicircularis lateralis 



Oeniculum of tho aqueduct of Fallopius ^^^ Pyramid, or eminentia papillaris 



Gemculum canalis facialis /fc ^ Eminentia pyramidalis 



Hiatus Fallopii * 



Hiatus canalis facialis ' 



-Tympanic sinus 



Sinus tympani 



Apex of the petrous portion 

 Apex pyramidis 



Carotid canal 



Canalis caroticus 



Caroticotympanic canaliculi / 



Canaliculi caroticotympanici 



Grooves of the promontory (for the nerves of the tympanic plexus) 



Sulcus promontorii 



Mastoid cells 

 Cellulae mastoideae 



Aqueduct of Fallopius Canalis facialis 

 \ Subiculum promontorii Subiculum promontorii 

 Fenestra rotunda Fenestra cochleae 

 ''Upper aperture of the tympanic canaliculus (for the passage of 



Jacobson's nerve) 

 Apertura superior canaliculi tympanic! 



FIG. 138. VERTICAL SECTION THROUGH THE LEFT TEMPORAL BONE, CROSSING OBLIQUELY THE 

 SUPERIOR BORDER OF THE PETROUS PORTION, AND PASSING THROUGH THE POSTERIOR POR- 

 TION OF THE MASTOID PROCESS, TO DEMONSTRATE THE TYMPANIC CAVITY, CAVUM TYMPANI, 

 AND THE ADJOINING PARTS. 



A bristle has been passed through the canaliculus tympanicus (the canal for Jacobson's nerve the 

 tympanic branch of the glossopharyngeal. nerve) into the tympanum, and, after traversing this 

 cavity, leaves it by the canaliculus that opens into the groove for the small superficial pet 



Os temporale Temporal bone. 



92 



