98 



A MANUAL OF ANATOMY 



The superior or orbital surface is triangular, smooth, and slightly 

 concave, and it forms the greater part of the floor of the orbit. 

 This portion of the bone is known as the orbital plate. It presents 

 the infra-orbital groove, which, commencing at the posterior border 

 in a notch, ultimately becomes converted into the infra-orbital 

 canal. This canal transmits the infra-orbital nerve and vessels. 

 From its posterior part the middle dental canal, for the middle 

 superior dental nerve and artery, passes downwards and forwards 



Nasal Process 



For Lachrymal Bone 

 Lachrymal Tubercle ^^ 

 Lachrymal Notch \ \ 



For Nasal Bone 



Orbital Surface 

 1 

 Infra-orbital Groove I 

 1 



Openings of ^' 

 Post Dental Canals - 



Nasal Notch 



-Anterior Nasal 

 Spine 



Tuberosity 

 Zygomatic Surface 



Malar Process 



' Palatal Process 



Incisor Fossa 



Canine Fossa 



Infra-orbital Foramen 



Fig. 6o. — The Right Superior Maxillary Bone (External View). 



to the bicuspid alveoli, lying at first in the postero-external wall 

 of the antrum, and subsequently in the antero-external wall. This 

 canal is often for the most part a groove. The anterior dental 

 canal, for the anterior superior dental nerve and artery, descends 

 in a branching manner from the anterior part of the infra-orbital 

 canal to the incisor and canine alveoli, lying in the antero-external 

 wall of the antrum. At the anterior and inner part of the orbital 

 plate, external to the lachrymal groove, there is a slight depression 

 which gives origin to the inferior oblique muscle of the eyeball. 



