The<unk>  is a large, air-filled space above and behind the nose in the middle of the face. The<unk>  septum divides the<unk>  into two<unk> es, also known as fossae. Each<unk>  is the continuation of one of the two nostrils. The<unk>  is the uppermost part of the respiratory system and provides the<unk>  passage for inhaled air from the nostrils to the nasopharynx and rest of the respiratory tract. The paranasal sinuses surround and drain into the<unk> .
Nasal cavity
Oropharyngeal airway
Hemotympanum
Nasopharyngeal airway
Lacrimal sac
Mouth
Craniopharyngeal canal
Orbital septum