The bones of the human body that contain air are mainly concentrated in the head and face. The main air-containing bones are the frontal bone, maxilla, sieve bone, pterygoid bone, temporal bone and so on. However, only the temporal bone is not involved in the formation of the sinuses. The temporal bone is also categorized as an air-bearing bone because of the small air-bearing cavities within it. The frontal bone is located deep in the forehead of the human body, where, in addition to forming the front part of the cranial cavity, its lower part is also involved in the formation of the frontal sinus. The maxilla has irregular air-containing cavities within it, known as the maxillary sinuses. The maxilla is the largest of the air-containing bones. The pterygoid bone is located deep below the skull and has small cavities within it that are primarily involved in the formation of the pterygoid sinus. The sieve bone is located deep within the root of the nose and also has small cavities within it that are mainly involved in the formation of the sieve sinuses. The air-bearing bones in the human body are mainly responsible for resonance and weight reduction. In addition to this, these bones protect the vital organs in their depths.