THE N'ASAL CARTILAGE?. 



665 



U'ards ; and, secondly, of the two nasal fossae, in which the olfactory 

 nerves are expanded. The nasal fossae are separated from each other 

 by a partition, septum nasi, formed of bone and cartilage : they 

 communicate with hollows in the neighbouring bones (ethmoid, sphe- 

 noid, frontal, and superior maxillary) ; and they open backwards into 

 the pharynx through the posterior naves. The skin of the nose is 

 studded, particularly in the grooves of the ate or outer walls of the 

 nostrils, with numerous small openings, which lead to sebaceous follicles. 

 Within the margin of the nostrils there is a number of short, stiff, 

 and slightly curved hairs — vibrissa- — which grow from the inner surface 

 of the ala3 and septum nasi, 



CARTILAGES OF THE NOSE. 



These are the chief support of the outer part of the organ. They 

 occupy the triangular opening seen in front of the nasal cavity in the 

 dried skull, and assist in forming the septum between the nasal fossce. 

 There are usually reckoned two large and three small cartilages on 

 each side, and one central piece or cartilage of the septum. 



Fig. 478. 



Fig. 479. 



Fig. 480. 



Fig. 479. — Fkont View op the Cartilages 

 OF THE Nose (ArnolJ). -J 



a, a', nasal bones ; 1, 1', upper lateral 

 cartilages or wing-like expansions of the 

 septal cartilage ; 2, 2', lower lateral car- 

 tilages. 



Fig. 478— Lateral View of the 

 Cartilages of the Nose (Ar- 

 nold), f 

 a, right nasal bone ; h, nasal 



process of the superior maxillary- 

 bone ; 1, upper lateral cartilage or 



Vi'ing-like expansion of the septal 



cartilage ; 2, lower lateral cartilage 



(outer part) ; 2*, inner part of the 



same ; 3, sesamoid cartilages. 



The upper lateral cartilages (cartilagines laterales nasi) (figs. 478 and 

 471), 1) are situated in the upper part of the projecting portion of the 

 nose, immediately below the free margin of the nasal bones. Each 

 is flattened and triangular in shape, and presents one surface out- 

 wards, and the other iuv/ards towards the nasal cavity. The anterior 



Fig. 480. — View of the Cartilages of the 

 Nose from below (Arnold), f 



2, 2', outer part of the lower lateral car- 

 tilages ; 2*, 2*, inner part of the same ; 4, 

 lower edge of the cartilage of the septum. 



