The term "Highmore Antrum of" refers to a cavity located in the maxillary sinus, which is found in the bones of the face. This anatomical region can also be known as the maxillary sinus or the maxillary antrum. Synonyms for the phrase "Highmore Antrum of" include maxillary sinus cavity or simply sinus cavity. It is an air-filled space within the bone that plays a role in regulating the temperature and humidity of the air we breathe. Understanding the various synonyms for this term can help in studying the structure and function of the facial bones and their role in the respiratory system.