REGION OF THE EYE. 



73 



walls, on the contrary, are thin and weak. The thin orbital plate of the frontal bone 

 above is frequently fractured in puncture wounds by foreign bodies, and the frontal 

 lobe of the brain injured. Two such instances have come under the writer's care; 



Supra-orbital notch 



Lachrymal groove 

 Optic foramen 



Sphenoidal (superior 

 orbital) fissure 



Sphenomaxillary (in- 

 ferior orbital) fissure 



FIG. 86. The bony orbit. 



Infra-orbital sulcus 



Infra-orbital foramen 



in the first case, an iron hook had penetrated and caused death from cerebritis ; in 

 the second, the wound was caused by a carriage pole. The patient recovered, 

 notwithstandhig a considerable loss of brain tissue. 



Sphenoidal sinus 



Inferior orbital 

 fissure 



Infra-orbital sulcus 



Ethmoidal cells 

 1 canal 



chry 



asal septum 



FIG. 87. Transverse section of the orbital and nasal cavities viewed from above. 



To the medial side of the inner wall are the ethmoid cells, covered by the thin 

 lachrymal bone and the os planum of the ethmoid. They are readily perforated by 

 suppuration from within those cavities. The floor is chiefly formed by the thin 



