Bone lesions in the jaw can cause the jawbone to bulge. The bones and muscle tissues that make up the upper and lower parts of the mouth. The upper part is called the maxilla and the lower part is called the mandible. The bones of the jaw are the maxilla, which is divided into the maxilla and mandible. Inside, there is the Hi-ghmori’s sinus (maxillary sinus maxillarsinus), which opens on the medial side. Among the four protuberances, the frontal, zygomatic and palatal protuberances, each of which is connected to a bone block of the same name, the alveolar protuberances have alveolar grooves, in which the maxillary teeth are located. The human maxilla consists of a combination of the narrow maxilla and the premaxilla, between which there is an opening for the incisal canal (stensen’s canal) that connects the nasal cavity to the oral cavity. Evolutionarily, both bones began to appear in scleractinian fishes, and in the maxillae of planktivorous fishes there is a movable connection between the palatine cartilage belonging to the first gill arch and the cranium.