THE NASAL FOS8JE 



1083 



These various cartilages are connected to each other and to the bones by a tough fibrous 

 membrane, which allows the utmost facility of movement between them. 



The muscles of the nose are situated beneath the integument; they are (on each side) the 

 Pyramidalis nasi, the Levator labii superiores alaeque nasi, the Dilatator naris, anterior and pos- 

 terior, the Compressor nasi, the Compressor narium minor, and the Depressor alae nasi. They 

 have been previously described (p. 372). 



The integument covering the dorsum and the sides of the nose is thin, and loosely connected 

 with the subjacent parts; but the integument of the tip and the alae of the nose is thicker and 

 more firmly adherent, and is furnished with a large number of sebaceous follicles, the orifices of 

 which are usually very distinct. 



The mucous membrane lining the interior of the nose is continuous with the skin externally 

 and with the mucous membrane which lines the nasal fossae within. 



The arteries of the nose are the lateralis nasi from the facial, and the inferior artery of the 

 septum from the superior coronary, which supply the alae and septum, the sides and dorsum being 

 supplied from the nasal branch of the ophthalmic and the infraorbital. The veins of the nose 

 terminate in the facial and ophthalmic. The lymphatics of the outer nose are shown in Fig. 

 557. They empty chiefly into the submaxillary lymph nodes. The nerves for the muscles of 

 the nose are derived from the facial, while the skin receives its branches from the infraorbital, 

 infratrochlear, and nasal branches of the ophthalmic. 



THE NASAL FOSS-ffl (CAVUM NASI). 



The nasal fossae are two irregular cavities situated in the middle of the face, 

 one on each side of the mesal plane. They open in front, when the soft parts 

 are in place, by the two nostrils or anterior nares, and terminate, behind, in the 

 nasopharynx by the posterior nares. 



Orifice of Eustachian tube Fossa of 



Bosenmuller 



FK;. 790 Outer wall of nasal fossa 



The anterior nares (nares] are somewhat pear-shaped apertures, each measur- 

 ing about one inch (2.5 cm.) antero-posteriorlv and half an inch (1.2 cm.) trans- 



