THE BONES OF THE HEAD 



105 



upper part of the internal surface on a level with the orbital border. 

 It is triangular, and its superior or orbital surface presents a sweep- 

 ing concavity, which enables it to form the front part of the outer 

 wall of the orbit, and a portion of the floor. This surface is pierced 

 by one or, it may be, two openings. If there is one, it ultimately 

 leads to two canals — malar, which opens on the external surface, 

 and temporal, which opens on the temporal di\4sion of the internal 

 surface, as a rule near the frontal process. These canals transmit the 

 malar and temporal branches of the temporo-malar or orbital nerve. 

 If there are two, each leads to its own canal. The inferior surface 

 of the orbital process, which is convex, forms the anterior part of 

 the temporal fossa. The rough margin of the process articulates 

 by its superior part wdth the anterior border or malar crest of the 



Frontal Process (Sup. Ang.) 

 Malar Foramen 1 1 



Marginal Process 

 Tenqioral Border 



Orbital Border 



Zygomatic Process (Post. Ang.) 



Masseteric Border 



Malar Tuberosity 

 Malar Tuberck (Inf. Ang.) 



Maxillary Border 



Infra-orbital Process 

 (Ant. Ang.) 



Fig. 63. — The Right M.\lar Bone (External View). 



great wing of the sphenoid, and below with a part of the orbital 

 plate of the superior maxUla. The part of this border between the 

 sphenoidal and maxillary portions sometimes closes the cmterior 

 and outer extremity of the spheno-maxillary fissure, and thus 

 intervenes between the great wing of the sphenoid and the superior 

 maxilla. 



The processes are four in number — superior, posterior, inferior, 

 and anterior. The superior or frontal process is stout and promi- 

 nent. Its direction is vertically upwards, and it terminates in 

 a thick serrated extremity for the external angular process of the 

 frontal. The posterior or zygomatic process is short and usually 

 blunt. Its direction is backwards, and it terminates in a serrated 

 extremity for the zygoma of the temporal. The inferior or maxillary 

 process is blunt and truncated. Its direction is downwards, and 



