A B Nasal cavities 口An oral cavity口腔is separated from the -Nasopharynx nasal cavity by the Pharynx palates. Oropharynx Laryngopharynx Unlike nasal cavity,the Oral cavity -Laryngeal inlet openings (oral fissure and Larynx oropharyngeal isthmus)can Trachea Esophagus be opened and closed. 6  An oral cavity口腔 is separated from the nasal cavity by the palates. Unlike nasal cavity, the openings (oral fissure and oropharyngeal isthmus) can be opened and closed