According to Healthline, the maxilla performs the function of supporting the teeth in the posterior position. The maxilla completes the upper part of the jaw and fuses two bones along the position of what is known as the palatal fissure.
The maxilla assists in forming lower parts and sides of each nasal cavity, eye sockets and upper jaw. In addition, the maxilla is positioned in such a way to decrease the heaviness of the person's skull. Every half part of these fused bones consists of the alveolar, palatine, frontal and zygomatic processes associated with the maxilla. In the case of an accident or a severe blow, the maxilla can fracture, causing feeling loss to the cheeks or lips and displacement of teeth.