Which bone forms the upper jaw?

The bone that forms the upper jaw is the maxilla. This bone plays a crucial role in forming the structure of the face and supports the upper teeth, allowing for functions such as chewing and speaking. The maxilla also contributes to the formation of the orbit (eye socket) and houses the nasal cavity, giving it a significant role in both aesthetic and functional aspects of the facial anatomy.

In contrast, the ethmoid bone is located between the eyes and contributes to the nasal cavity structure but is not involved in forming the jaw. The lacrimal bone is small and located in the front part of the medial wall of the orbit, primarily associated with tear drainage. The zygomatic bone, also known as the cheekbone, contributes to the prominence of the cheeks but does not form part of the upper jaw. Understanding the anatomy of these facial bones is essential for estheticians as it impacts both treatments and overall facial aesthetics.