THE ORBITS 



77 



foramen); and the suture between the frontal ])one and the na.sal process of the 

 niaxilhi; and in the inferior segment of the eircumference is the malo-maxillary 

 suture. Oeeasionally, the infraorl)ital foramen opens by a narrow fissure into 

 the orbit. 



Tlie roof (.f tlie orl)it is formed mainly by the orbital plate of the frontal bone, 

 and eom])l('ted posteriorly by the lesser wing of the sphenoid. At the outer angle 

 it presents the lachrymal fossa for the lachrymal gland, and at the inner angle a 

 depression for the pulley of the svperior oblique nuiscle. 



Fio. Ho.— The Skull. (Norma facialis.) 



SUPERCILIARY RIDGE 



SUBNASAL POINT 



CANINE EMINENCE 

 ALVEOLAR POINT . 





I 





The floor is formed by the orbital plate of the maxilla, the orbital process of 

 the malar, and the orbital process of the palate bone. At its inner angle it presents 

 the lachrymal canal, and near this a depression for the origin of the inferior oblique 

 muscle. The floor has a furrow for the infraorbital artery and the second division 

 of the fifth nerve. The furrow terminates anteriorly in the infraorbital canal, 

 through which the infraorbital nerve and artery emerge on the face. Near the 

 commencement of the canal a narrow passage, the anterior dental canal, runs for- 



