1068 



ORGANS OF SPECIAL SENSE 



bones and the frontal processes and anterior nasal spines of the two maxillae (pp. 76- 

 80). 



The nasal cartilages. There are five principal cartilages: superiorly, the two 

 lateral nasal cartilages, inferiorly the two yrcuttr alar (lomr kittral) cartilages, and 

 the single median nasal septal cartilage. Besides these there are the. lesser tilur 

 cartilages, the sesamoid cartilages, and the romcro-nasal cartilages of Jacobson. The 



Fio. 765. VENTRAL VIEW OF THE EXTERNAL NOSE, SHOWING ITS CART i LACKS, ETC. 



ORIFICE OF LACHRYMAL CANAL 



GROOVE ON ANTERIOR BORDER OF 

 NASAL SEPTAL CARTILAGE 



SESAMOID CARTILAGES 

 LESSER ALAR CARTILAGES 



CELLULAR TISSUE OF ALA 



NASAL BONE 



NASAL PROCESS OF THE MAXILLA 



LATERAL NASAL CARTILAGE 



LATERAL CFiUS OF GREATER ALAR 

 CARTILAGE 



lateral nasal cartilages are triangular and nearly flat lateral expansions of the 

 septal cartilage, placed one on each side of the nose just inferior to the nasal bone. 

 Each presents an inner and an outer surface and three borders. The medial bor- 

 der is continuous in its superior third with the ventro-superior margin of the sep- 

 tal cartilage, and through this with its fellow of the opposite side, but it is separated 

 inferiorly from the septal cartilage by a narrow cleft. The curved dorso-lateral 



Fio. 766. INFERIOR VIEW OF THE EXTERNAL NOSE, SHOWING ITS CARTILAGES, ETC. 



NASAL SEPTAL CARTILAGE 



LATERAL CRUS OF GREATER ALAR 

 CARTILAGE 



MEDIAL CRUS OF GREATER ALAR 

 CARTILAGE 



ANTERIOR NASAL SPINE OF THE MAXILLA 



c NASAL SEPTAL CARTILAGE 

 Cellular tissue of ala 



border is firmly attached by strong fibrous tissue to the nasal bone and frontal 

 process of the maxilla, and underlies these bones for a considerable distance, especially 

 near the septum. The inferior border is connected by fibrous tissue to the greater 

 alar cartilage. The greater alar (lower lateral) cartilages are situated one on each 

 side of the tip of the nose (figs. 764, 766) . Each is thin, pliant , curved, and so folded 

 that it forms a medial and a lateral cms, which bound and tend to hold open each naris. 

 I he medial cms is loosely attached to its fellow of the opposite side, the two being 



