THE SKULL AND THE BONES OF THE SKULL 65 



Anterior surface of the petrous portion Facies anterior pyramidis 



Geniculum of the aqueduct of Fallopius (the canal for the 



facial nerve) 

 Geniculum canalis facialis 



Transverse crest, or crista falciformis 

 Crista transversa 



Superior border of the petrous portion 



Angulus superior pyramidis 



Fundus of the internal auditory meatus, 

 or reniform fossa 



Fundus meatus acustici interni 



Posterior surface of the petrous portion ^? 



Facies posterior pyramidis 



Posterior border of the petrous portion 

 Angulus posterior pyramidis 



Cochlea / 

 Cochlea 



Inferior surface of the petrous portion / 

 Facies inferior pyramidis 



Tegmen tympani 

 Tegmen tympani 



Petrosquamous fissure 



. Fissura petrosquamosa 

 Roof of the tympanum 

 Paries tegmentalis cavi tympani 

 Cochleariform process 

 Processus cochleariformis 



Fissure of Glaser, or petrotympanic fissure 

 Fissura petrotympanica (Glaseri) 



Inner wall of the tympanum 

 . Paries labyrinthicus cavi tympani 



11 



-^. Tympanum, or tympanic cavity 

 ^*\ Cavum tympani 

 Tympanic plate 

 Pars tympanica 

 1 'Anterior border of the petrous portion 



Angulus anterior pyramidis 

 Carotid wall of the tympanum Paries caroticus cavi tympani 



FIG. 133. VERTICAL SECTION THROUGH THE PETROUS PORTION OF THE LEFT TEMPORAL BONE 

 AND THROUGH THE ANTERIOR PART OF THE SQUAMOUS PORTION. (NOMENCLATURE OF THE 

 SURFACE AND BORDERS OF THE PETROUS PORTION.) 



Carotid canal 



Canalis caroticu 



Tympanic canaliculus (for Jacobson's nerve) 

 Canaliculus tympanicus 



Depression for the petrosal ganglion of the glosso- 

 pharyngeal serve Fossula petrosa 



Groove for the auricular branch of the 



pneumogastric (Arnold's nerve) 



Sulcus canaliculi mastoidei 



,-- Canaliculus for the auricular branch of 

 the pneumogastric (Arnold's nerve) 

 Canaliculus mastoideus 



Jugular fossa 



Fossa jugularis 



"--- "Canaliculus mastoideus 1 



Hiatus Fallopii 



Hiatus canalis facialis' , 



Cochlea 

 Cochlea 

 Aqueduct of Fallopius 



Canalis facialis 

 Internal auditory aperture 

 Porus acusticus internus 



Internal auditory meatus 



Meatus acusticus internus 



Fundus of internal auditory meatus, or reniform fossa 

 Fundus meatus acustici interni 



Vestibule of the labyrinth 



Vestibulum labyrinthi 



Tympanum 



Cavum tympani 



1KVB \M&\ 



\ Orifice of canal for chorda tympani nerve (iter 



chordae posterius) 

 Canaliculus chordae tympani 



1 Aqueduct of Fallopius Canalis facialis 



FIG. 134. AQUEDUCTUS FALLOPII, OR CANAL FOR THE FACIAL NERVE, SHOWN FROM BENEATH 

 BY THE REMOVAL OF A WEDGE-SHAPED PIECE FROM THE PETROUS PORTION OF THE LEFT 

 TEMPORAL BONE. 



The canaliculus tympanicus, for the tympanic branch of the glossopharyngeal nerve (Jacobson's nerve), is 

 also opened up throughout its whole length. A sound has been passed through the canaliculus for 

 the auricular branch of the pneumogastric nerve (nerve of Arnold). In the Continental nomenclature 

 this canaliculus is known as the canaliculus mastoideus. 



Os temporale Temporal bone. 



