Orbital Cavity. 



41 



frntttt 



F r. eth I ncfs - supraorbit. 



51. Left Orbital Cavity, Orbita. 



The outer wall of the orbit is formed by the malar bone and 

 the greater wing of the sphenoid the u p p e r wall or roof by the 

 orbital plate of the frontal bone; the inner wall by the nasal (frontal) 

 process of the superior maxillary, the lachrymal and the Lamina papyracea 

 (Os planum) of the ethmoid bones; the lower wall or floor by the 

 orbital surface of the superior maxillary and the orbital process of the 

 palate bones. The aperture of the orbit, Apertura orbitalis, is limited by 

 the Margo supra- et infraorbitalis; behind the circumference, superior- and 

 externally lies the lachrymal groove, Fossa glandulae lacrymalis. 



Foramina and canals of the orbit. To the cranial cavity lead : 

 the Foramen opticum, the Fissura orbitalis superior (sphenoidal fissure), the 

 Foramen ethmoidale anterius. To the nasal cavity: the Foramen ethmoidale posterius, 

 the Ductus naso-lacry mails. To the temporal fossa: the Canalis zygomaticus 

 temporalis ; to the spheno-maxillary fossa (Fossa ptcrygo-palatina) , the Fissura 

 orbitalis inferior (spheno-maxillary fissure). To the face lead : the Canalis 

 zygomaticus facialis, the Foramen supraorbitale. (Incisura supraorbitalis) and 

 the Canalis infraorbitalis. 



Heitzmann, Atlas. I. 6 



