THE NASAL CAA-ITY 



549 



framework is formed essentially by the septal cartilage and the parietal cartilages 

 which proceed from it. The septal cartilage projects beyond the premaxilla, and 



Fig. 4S8. — Sagittal Section of Head and Paet of Neck of Dog. 



porsal meatus 



Middle meatus 

 >\ TSk, / Ven tral m eat us 



Fig. 489. — Key to Preceding Figure. 



is much thickened at its extremity; it gives off from its margins the two parietal 

 cartilages, fltiich curve laterally and toward each other. A grooved plate extends 



