CARTILAGES OF THE NOSE. 



133 



fore part, the separation between the nasal fossae. The anterior margin of the 

 cartilage, thickest above, is firmly attached to the back of the nasal bones near 

 their line of junction ; and below this it lies successively between the upper and t In- 

 lower lateral cartilages, united with the former, which constitute its alae, and 

 connected loosely by fibrous tissue with the latter. The posterior margin is fixed 

 to the lower and fore part of the central plate of the ethmoid bone (e) ; and the 

 lower margin is received into the groove of the vomer (v), and rests anteriorly on the 

 incisor crest of the superior maxillae. 



This cartilage is the persistent anterior extremity of the primordial cartilaginous 



sinus of 

 sphenoid ;' 



', 

 proc. post, \< 



cart, septi '1C 



cthmovomerine suture pendicularlt 



vomer 

 2ialate-bone 



cartlhtffc of 

 septum 



cartilage of 



aperture 

 cartilage of 

 Jacobson 



Fig. 152. OSSEOUS AND CARTILAGINOUS SEPTUM OF THE NOSE, SEEN FROM THE SIDE. (Arnold.) 



cranium. In young subjects it is prolonged back to the body of the pre-sphenoid 

 bone ; and in many adults an irregular thin band remains between the vomer and 

 the central plate of the ethmoid (processus posterior s. sphenoidalis, fig. 152). The 

 vomerine cartilages (Huschke) or cartilages of Jacobson, are two small longitudinal 

 strips of cartilage which lie along the lower border of the cartilage of the septum, 

 attached to the vomer. They are not always distinct from the cartilage of the 

 septum and are relatively better developed in the embryo and in many of the lower 

 mammals conformably with the greater extent of development o the organ of 

 Jacobson (see p. 143), which, in some animals, they partly enclose. 



NA8AL FOSSJE. 



The nasal fossae are, as already stated, the cavities which occupy the interior of 

 the nose and effect a communication between the exterior and the pharynx. They 

 have been described in Vol. II. as they exist in the skeleton, but they are much 

 narrower in the living condition owing to the thickness and vascularity of the 

 lining membrane, which also covers over many of the apertures seen in the macerated 



