14 



Bones of the Cranium. 



Fissu-ra Gla 



/X^ M.di^astricus 



14. Left Temporal Bone, 0s temporum, from the outside. 



The t e m p o r a 1 bone is divided into 3 parts : 1 . the s q u a m o u s 

 portion, Pars squamosa s. Squama, 2. the petrous portion. Pars petrosa, 

 and 3. the mastoid portion, Pars mastoidca. 



The s q u a m o u s portion lias on the outer surface in front 

 and above the Meatns aiuUtort'iis externus, the zygoma tic process, 

 Procc'ssiis zygomaticus , formed by 2 roots; between the roots the glenoid 

 fossa, Foxsa, glenoldalls (for the condyle of the inferior maxilla"); in front 

 of this, the Eminantici, arttcnlaris or Tubsrculum articularc. The furrow for 

 the temporal artery is not constant. 



The m a s t o i d p o r t i o n shows on the outer surface the 

 mastoid process, Processes mastoidcus, which is grooved from below by 

 the Incixnra mastoidea, and is limited at the posterior periphery of the 

 external auditory rneatus by the Fissura tympano-mastoidea (in this the 

 end orifice of the Canaliculus mastoideus). The borders are: the superior, 

 strongly serrated , for articulation with the Anyidus mastoideus of the 

 parietal bone, and the posterior, slightly serrated for articulation with 

 the inferior portion of the lateral border of the occipital bone. 



