146 



TOPOGRAPHICAL ANATOMY OF THE 



and its anterior continuation formed by the palatine processes of the 

 incisive bones. A process from this border almost completely fills the 

 palatine fissure and forms the projection in the hard palate round which 

 the greater palatine artery curves. The upper border of the septal 

 cartilage is attached to the inner face of the interfrontal and the inter- 

 nasal sutures, and extends for about 5 cm. beyond the end of the nasal 

 bones. The border is produced on each side into a thin, narrow 

 parietal ^ cartilage (cartilago parietalis) that widens anteriorly and 

 projects beyond the free border of the nasal bone. 



Prolongation of the 

 ventral concha. 



Nasal bone. 



Parietal cartilage.' 



Incisive bone L 



Alar cartilage. 



Fig. 61. — The cartilages of the nostril. 



The alar ^ cartilages (cartilagines alares), which should be com- 

 pletely exposed by the removal of the muscles of the nostrils, are 

 conspicuous and important appendages to the cartilage of the nasal 

 septum. Each of these cartilages is shaped like a comma and consists 

 of a broad lamina, which is dorsal in position, and forms the resisting 

 basis of the medial wing of the nostril, and a curved, flattened rod, the 

 cornu, that sweeps downwards and outwards from the lamina, and can 

 be detected before dissection by manipulation of the rounded lower 

 angle of the nostril. The alar cartilages are united to the end of the 

 septal cartilage by stout fibrous tissue that allows of a certain amount 

 of movement, the union taking place in the region of the junction of 

 the lamina and cornu. 



Other cartilages connected with the nose are the vomero-nasal 

 cartilage (better examined at a later stage), and a small, curved and 

 grooved rod of cartilage that continues the ventral turbinated bone and 



1 Paries [L], a wall. 



- Ala [L], a wing. 



