PLATE XLVI. 



THIRD VIEW OF PTERYGOID REGION AND ORBIT FROM 



THE OUTER SIDE. 



In the dissection represented in this plate the capsule of the temporo-mandibular 

 joint has been cut, and the condyle of the jaw, its iuterarticular cartilage, and the external 

 pterygoid have been pulled forwards to expose the third division of the fifth nerve 

 which lies behind it. Two saw cuts have been made through the outer wall of the 

 orbit parallel to the floor and roof, and the outer wall partly cut away and partly turned 

 forwards. In chipping away the posterior part to allow a better view, the dura mater 

 of the middle fossa of the skull has been exposed. 



In the plate the stylo-mastoid artery is shown as a branch from the occipital ; this 

 is not (infrequently the case when the vessel is not given off by the post-auricular. 



