T1IK XOSE 



ORIGINALLY \V KITTEN IIY AKTIU i; Hi \>M.\S. I'.K.C.S., AND REVISED KOH SEI-DXD AMI 

 TIIIKII KhiTiiiss in \LIIMK RoBimON, M.D.. M.H.C.S.; KI.\I-I:I> AND I.AIC 

 REWRITTEN KHI Foi KTII KIUTKPN 



BY ABRAM T. KKIiH. B.S., M.D., 



PROFESSOR OF AVATOMY IS TIIK OORXKI.L UNIVERSITY MKDICA1. COI.LKOE 



The nose contains the organ of smell and serves also as one of the organs of respi- 



ration. It (-(insists of the external nose, the nasal cavity, and the para nasal sinuses 

 (accessory cavities). 



The external nose (fig. 764) is shaped like a triangular pyramid. At the fore- 



Fio. 764. THE LEFT SIDE OP THE EXTERNAL NOSE, SHOWING ITS CARTILAGES, ETC. 



NASAL BONE 

 NASAL PROCESS OF THE MAXILLA 



LATERAL NASAL CARTILAGE 

 NASAL 8EPTAL CARTILAGE 



LATERAL CPUS OF GREATER ALAR 

 CARTILAGE 



MEDIAL CRUS OF GREATER ALAR 

 CARTILAGE 



SESAMOID CARTILAGES 

 Fibrous tissue 

 LESSER ALAR CARTILAGES 



CELLULAR TISSUE FORMING ALA 



head, between the eyes, is the root of the nose, and from this, extending inferiorly 

 and ventrally, is a rounded ventral border, I lie dorsum of the nose, which may be 

 either straight, convex, or concave, and which ends inferiorly at the apex or tip. 

 The superior part of the dorsum is known as the bridge. Inferiorly, overhanging 

 the upper lip, is the base of the nose, which presents two orifices, the naresor nostrils, 

 separated from one another by the inferior movable part of the nasal septum. The 

 sides of the nose slope from the dorsum laterally and dorsally. and inferiorly are 

 expanded and more convex, forming the alae nasi. Kach of these is separated from 

 the rest of the lateral surface by a sulcus. and the inferior free border of each bounds 

 a nans laterally. 



The framework of the external nose is formed partly of bone and partly of hyaline 

 cartilage. The bones, which form only the smaller superior part, are the two nasal 



' 10(17 



