THE CARTILAGES OF THE NOSE. 



Nasal 

 cartilages. 



EXTERNAL PARTS OF THE NOSE. 



Directions. The external parts of the nose, the appendages of 

 the eye, and the pinna will now be cleaned and examined. 



The NOSE has the form of a three-sided pyramid, which is External 

 attached to the face by one of its surfaces, while the base is free. no: lts 

 The lateral surfaces meet anteriorly in a rounded edge termed the 

 (/O/V/M, the upper part of which is known also as the bridge. The 

 lower and posterior part of each lateral surface is convex and 

 marked off by a curved groove, constituting the ala. The base pre- 

 sents the oval apertures -of the nostrils or anterior nares, separated 

 by a short thick partition, the septum narium or columna nasi. 



The shape of the nose is maintained by a framework consisting and frame 

 <>f the nasal bones and the nasal processes of the superior maxillarv work - 

 bones above, and of the cartilages of the 

 nose below, in the part corresponding to the 

 anterior nasal aperture of the skull. 



CARTILAGES OF THE NOSE (fig. 206). 

 These are five in number, one in the centre, 

 the cartilage of the septum, and two on each 

 side, the lateral cartilage and the cartilage of 

 the aperture. They are all hyaline cartilage, 

 but do not show any tendency to become 

 ossified. Only the lateral cartilages are 

 learnt in this stage of the dissection. 



Dissection. The lateral cartilages will be 

 seen when the muscular and fibrous struc- 

 tures of the left side of the nose have been 

 taken away. By turning aside the lateral 

 cartilages the septal one will appear in the 

 middle line. 



The lateral cartilage (upper lat. cart, 

 fig. 206, ^) is flattened, and triangular in 

 form. Posteriorly it is attached to the nasal 

 and upper maxillary bones ; and anteriorly 

 it joins the cartilage of the septum above, 



but is separated from it by a narrow cleft below. Inferiorly, the 

 lateral cartilage is contiguous to the cartilage of the aperture, and 

 is connected to it by fibrous tissue. 



The cartilage of tlie aperture (lower lat. cart. ; fig. 206) forms a ring The lower 

 around the opening of the nose except behind. It has not any 

 attachment directly to bone ; but it is united above to the lateral 

 cartilage by fibrous tissue, and below with the dense teguments 

 forming the ala of the nose and the margin of the nostril. 



The part of the cartilage ( 3 ) which bounds the opening externally one part 

 is narrow and pointed behind, where it forms two or three vertical outside " 

 folds, and sometimes becomes divided into as many small pieces 

 cartilagines quadrates ; but it swells out in front where it touches its accessory 

 fellow, and forms the apex of the nose. cartilages ; 



The inner part ( 4 ) is shorter and narrower. It projects backwards another in- 

 side nostril. 



Take away 

 tissue from 



FIG. 206. CARTILAGES surface - 



OF THE NOSE. 



1. Septal cartilage. 



2. Lateral cartilage. 



3. Cartilages of the 

 aperature, its outer 



, . . . vxiiinagc 



part, and 4, its inner joins the 

 part. septal. 



5. Nas.il bone. 



