parotic process. The exoccipital component is the parotic 

 ramus of that bone [66] which arches over the inner part 

 of the aperture of the cavity, lateral to this the posterior 

 end of the opisthoic appears, bearing at its lower angle the 

 capiti-plastralis tubercle [25], As seen from above the 

 opisthoic lies obliquely in front of the exoccipital, articu- 

 lating medially with the epiotic region of the supraoccipital, 

 and with the parotic ramus of tin- quadrate and the prootic 

 in front. This last bone articulates also with the conjoined 

 rami of the quadrate. Near its hinder end the quadrato- 

 prootic suture is perforated by the temporal foramen [42]. 

 The prootic articulates medially with the epiotic region of 

 the supraoccipital. In front it articulates with the prootic 

 process of the pterygoid, between this articulation and 

 that with the quadrate is the foramen {foramen .://(/<>- 

 mat i Cum) through which the jugular vein within the 

 anterior portion of the acustico jugular cavity, receives a 

 tributary from the zygomatic fossa. 



The anterior margin of the prootic forms the posterior 

 border of the foramen ovale [40] transmitting superior and 

 inferior maxillary branches of the fifth nerve. The anterior 

 border of the foramen ovale is the posterior margin of the 

 alisphenoid plate of the parietal [20] and of the epipterygoid 

 process [21] of the pterygoid, anterior and posterior borders 

 converging, meet above ; the inferior border is the lamina 

 between epipterygoid and prootic processes of the pterygoid. 



The jugular caual [32] issues from beneath the prootic 

 immediately behind the foramen ovale, its outer wall being 

 formed by the prootic process of the pterygoid. 



The anterior aperture of the carotid canal is just below 

 and medial to that of the jugular canal, in front of both is 

 a sulcus between the rostrum of the barisphenoid and the 

 pterygoid bone (sulcus carotieo-jiujitlaris) [51] the lower 

 portion of which as far forward as the carotid foramen [47] 



