CHAP. III.] 



SKELETON OF THE HEAD AND TRUNK. 



59 



shadow in front of ^s), which bounds the base of the cranium in front 

 as the foramen magnum bounds it behind. 



The middle of the hinder part of the under surface of the face 

 thus forms the ventral margin of the hinder nostril, while on either 

 side, the face receives the termination of the arch of the z5^goma. 

 It thence narrows as it proceeds forwards, forming a triangular 

 bony plate, slightly truncated in front, and bordered by teeth. 



When the skull is looked at in front, we see on each side of its 

 highest part, with its rounded outline (the forehead), the great 



Fig. 30.— Skull viewed from in feont, with the Lower Jaw detached. 



an. Angle of mandible, 

 c. Canines. 



c. (Of lower jaw) ooronoid process. 

 / Frontal. 

 i. Incisors, 

 m. Maxilla. 

 n. Nasal. 



■pf. Post-orbital process of frontal. 



jij. Post-orViital process of malar. 



-pm. Pre-maxilla. 



■pmo. Pre-niolars and inferior true molar. 



y. Condyle of niandil)le. 



2. Infra-orbital foramen. 



13. Mental foramen. 



sockets for the eyes, termed the orhits. These are not completely 

 surrounded by bone, but are bounded below and externally by the 

 zygoma and a process (j/?/), and above by another process {pf) from the 

 skull roof, and behind by the wall of the cranium. The part of the 

 skull which juts out laterally to support the floor of the orbit is called 

 the " malar prominence." Between the orbits is the bony pro- 

 minence of the nose, beneath which is a small, somewhat heart- 

 shaped aperture, the front bony nostrils or anterior narcs. 



Beneath each orbit is the small bony cheek, and the skull is 

 bounded below (the lower jaw or mandible being removed) by the 

 alveolar border giving attachment to the teeth. 



