Answer:
<h3>Mandible bone</h3>
Explanation:
The nasal cavity externally opens through the nostrils, continues to the pharynx, where, further joins the remaining respiratory system. In the middle, it is separated by the nasal septum. The division of nostrils includes roof, floor, and walls whereas the nasal cavity is divided into the
a) vestibule - It is the dilated area at the nostril opening
b) respiratory - It is the passages through which air travels into the respiratory system
c) olfactory sections- It has olfactory receptors & Bowman's glands.
Surrounding structures:-
a) Para-nasal sinuses
b) Nasolacrimal ducts
c) Oral cavity
