The upper jaw, also known as the maxilla, is a crucial part of the human skull. It holds the upper teeth and forms the roof of the mouth, as well as the floor of the eye sockets. The maxilla connects with several other bones in the face, providing structure and support. In addition to housing the teeth, the upper jaw plays a vital role in functions like chewing and speaking. It also contains the sinuses, which are air-filled spaces that help with breathing and voice resonance. Proper alignment of the upper jaw is important for overall dental health.