Bones of the Skull. 



57 



Ala parva ossis sphenoidalis 



Foramen supraorbitale 

 Sutura sphenofrontalis j 



Facies orbitalis alae ruagnae ossis sphenoidalis 



Facies orbitalis ossis frontalis 

 Sutura zygomaticofrontalis 



Fissura orbitalis superior 

 Foramen opticum 



Sutura sphenoethmoidalis 



Foramen ethmoidale posterius 



Lamina papyracea ossis ethmoidalis 

 Sutura frontoethmoidalis 

 Foramen ethmoidale antenna" 



Sutura frontolacrimalis 



Facies orbitalis ossis zygomatici 



Sutura sphenozygomatica 



Fissura orbitalis inferior 



Sutura zygomaticomaxillaris 



Sulcus infraorbitalis 



j Fossa sacci lacrimalis 



Os lacrimale 



Sutura lacrimomaxillaris 

 Sutura ethmoideomaxillaris 

 : Facies orbitalis maxillae 

 Processus orbitalis ossis palatini 



7O. Right orbital cavity, orbita, from m front. 



Outline drawing with explanation of Fig. 69. Magnification 5:4. 



The walls of the orbit go over into one another, usually with rounded angles, and are 

 lined by a thin periosteum, the periorbita. 



The medial wall, paries medialis (see also Fig. 68), is placed nearly sagittally. It 

 is composed of the os lacrimale, the lamina papyracea oss. ethmoidalis and the lateral surface 

 of the corpus oss. sphenoidalis. It presents the sutura lacrimomaxillaris (between os lacri- 

 male and proc. frontalis maxillae), the sutura frontolacrimalis (between os lacrimale and pars 

 orbitalis oss. frontalis), the sutura frontoethmoidalis (between pars orbitalis oss. frontalis and 

 os ethmoidale) as well as the sutura sphenoethmoidalis (between os ethmoidale and corpus 

 oss. sphenoidalis). Near the anterior margin lies the fossa sacci lacrimalis which is continuous 

 below with the canalis nasolacrimalis. At the junction of the medial with the upper wall go 

 off the foramina ethmoidalia anterius et posterius, of which the anterior leads constantly into 

 the skull cavity upon the lamina cribrosa oss. ethmoidalis, the posterior also to the same place 

 or only as far as the posterior ethmoidal cells. From the most posterior angle the foramen 

 opticum passes to the skull cavity. 



