10 



Bones of the Skull. 

 Processus zygomaticus 



Squama temporally 



/ Fissura petrotympanica [Glaseri 



Tuberculum articulare 



Fossa mamlibularis 

 Pars tympanioa 



Processus styloideus 



Foramen stylomastoideuni 

 Processus mastoideus 



Incisura mastoidea 

 Sulcus a. occipitalis 



Pars petrosa 



Processus inferior - 



tegminis tympani 



Canalis musculotubarius 



Foramen caroticum internum 

 Angulus anterior pyramidis 



Apex pyramidis 



Facies inferior pyramidis 

 Angulus posterior pyramidis 

 Foramen caroticum externum 

 - Canaliculus caroticotympanicus 

 Fossula petrosa 



-- Apertura externa canaliculi cochleae 

 - Incisura jugularis (medial compartment) 



Processus intrajugularis 

 " Fossa jugularis 

 Incisura jugularis (lateral compartment) 



Canaliculus mastoideus 



Pars mastoidea 



9. Right temporal bone, os temporale, from below. 



Fades inferior pyramidis (continued). Situated almost exactly in front of the 

 fossa jugularis is a large round opening, the foramen caroticum externum, which forms the 

 entrance to the canalis caroticus (for the a. carotis interna, plexus venosus caroticus internus ; 

 plexus caroticus internus). This canal is curved and passes obliquely from behind and lateral- 

 ward, forward and medianward through the pyramid, and emerges near the apex by an irre- 

 gular opening, the foramen caroticum internum, partly on the inferior and partly on the 

 anterior surface. Near the external carotid foramen can be seen, in the canal, the small 

 openings of the canaliculi car otic otympanici (for the r. caroticotympanicus a. carotis internae ; 

 nn. caroticotympanici) , which pass upward to the middle ear. Between the external carotid 

 foramen, the jugular fossa and the apertura externa canaliculi cochleae lies a small depression, 

 the fossula petrosa (for the gangl. petrosum n. glossopharyngei) with a small opening, the 

 apertura inferior canaliculi tympanici (for the a. tympaniea inferior; n. tympanicus). Situated 

 lateralward and projecting downward and forward is the processus styloideus (for the lig. 

 stylomandibulare ; mm. stylohyoideus , styloglossus , stylophaiyngeus) , variously developed in 

 different individuals. Just behind it "lies the foramen stylomastoideum (for the a. and 

 v. stylomastoidea ; n. facialis). Closely attached to the styloid process in front is seen the 

 vagina processus styloidei (0. T. vaginal process), the lowest portion of the pars tympaniea. 



