Organ of Smell. 



215 



Spina nasal, sup. 

 e oss. front. 



Os nasale 



Cart, a 



Can. naso-pnlat. 



288. The Cartilaginous and Bony Septum of the 

 Nose, Septum narium cartilagineum et osseum. 



The cartilage of the septum, Septum cartilagineum seu Carti- 

 lago quadrangular is, completes the bony septum formed by the perpendicular 

 plate of the ethmoid bone and the vomer ; at its anterior inferior margin 

 is the Septum membranaceum. Below the nasal .bones are the two triangu- 

 lar cartilages, Cartilagines triangulares (upper lateral cartilages, Fig. 2 9 1 ), 

 and in the upper half of the wings of the nose, the two alar carti- 

 lages, Cartilagines alares (lower lateral cartilages, Fig. 291); between 

 these and the margin of the Incisura pyriformis are the sesamoid cartilages, 

 Cartilagines sesamoideae seu minores. 



The nasal cavity is lined by the pituitary or Schneider ian 

 membrane, Membrana pituitaria narium, which is continuous with the 

 skin through the nostrils, with the mucous membrane of the pharynx 

 through the posterior nares, Choanae. In the upper or olfactory region of the 

 mucous membrane, Eegio olfactoria, the filaments of the olfactory nerve are 

 distributed, and in this portion the sense of smell is lodged. In the lower 

 or respiratory region, Regio respiratoria, the filaments of the nasal bran- 

 ches of the Nervus trigeminus ramify, and in this part the sense of 

 touch only is lodged (Fig. 293). 



