94 



THE SKELETON 



of bone, the orbital process, which forms the anterior boundary of the temporal 

 fossa. The upper part gives origin to a few fibres of the temporal muscle, while 

 at the lower part is a large rough area for articulation with the zygomatic process 

 of the maxilla. 



The orbital process is placed at right angles to the remaining part of the bone 

 and forms the anterior portion of the lateral wall of the orbit. On the orbital 



Fig. 118. — The Left Zygoma.tic Bone. 

 A, the malar surface. B, the temporal and orbital surfaces. 



Frontal process 



Orbital border 



Malar canal 



Infra- 

 orbital 

 process 

 Intraorbital head Z^^:^^fe^ ■^^, 

 of quadraws muscle X^ -. /* ' 



Maxillary 

 border 



Zygomatic head 

 of quadrate muscle 



Zygoma ticus 



Processus marginalis Temporal 



Temporal border Temporal border 

 Zygomatic process 



Masseteric 

 border 



Masseter 

 Malar tubercle 



Masseteric 

 border 



Masseter 



B 



Frontal process 



Zygomatico-orbi- 

 tal canal 



illary 

 border 



Malar tubercle 



surface of the process are seen the foramina of two zygomatic© -orbital canals, 

 which transmit the zygomatico-facial and zygomatico-temporal branches of the 

 zygomatic branch of the fifth, together with two small arteries from the lacri- 

 mal. In some cases, however, the canal is single at its commencement on the 

 orbital plate and bifurcates as it traverses the bone. The rough free edge of the 



Fig. 119. — Skull showing the Right Malar Bone divided into Two Parts by a Hori- 

 zontal Suture. (From a specimen in the Museum of University College, London.) 



<v^ -V 



process articulates above with tlie zygomatic border of the great wing of the 

 sphenoid, and below with the maxilla. When the orbital process is large, it 

 excludes the great wing of the sphenoid from articulation with the maxilla, 

 and the border then presents near the middle a short, non-serrated portion 



