Nasal Fossa. 



43 



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53. The Nasal Fossa, Cavum narium. 



The nasal fossa is divided by the bony septum of the 

 nose, Septum narium osseum, into two halves ; this septum consists of 

 the perpendicular plate of the ethmoid bone (Lamina perpendicular, oss. 

 ethmoid.) and the vomer, and runs from the Lamina cribrosa and $>/ 

 nasalis superior to the Crista nasalis inferior. The bony parts of the ethmoidal 

 labyrinth, the Concha ethmoidalis superior (superior turbinated bone), Concha 

 ethmoidalis inferior (middle turbinated bone) and the inferior turbinated 

 bone (Fig. 52) form bony prominences on the walls of the nasal fossa. 

 Between the turbinated bones are the meatuses, Meatus narium, three 

 on each side, viz : the superior, between the superior and middle tur- 

 binated bones ; the middle, between the middle and inferior turbinated 

 bones; the inferior, between the inferior turbinated bone and floor 

 of the nasal fossa. In the superior open the posterior and middle 

 ethmoidal cells, and the spheno-palatine foramen; in the middle, the 

 anterior ethmoidal cells, the antrum of Highmore, and the frontal sinus; 

 in the inferior the naso-lachrymal duct. 



Foramina and canals of the nasal fossa. To the cranial cavity 

 lead the Foramina cribrosa; to the mouth the Canalis naso-palatinus ; to 

 the spheno-maxillary fossa the Foramen spheno-palatinum ; to the orbit the 

 Foramen ethmoidale posterius , the Ductus naso-lacrymalis ; to the face the 

 Apertura pyriformis and the Foramina nasalia. 



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