Which bones are known as the upper jawbones that assist in the formation of the orbit, nasal cavity, and palate?

The upper jawbones that assist in the formation of the orbit, nasal cavity, and palate are the maxillae. These paired bones form the central portion of the face and play a crucial role in defining the structure of the upper jaw. They not only house the upper teeth but also contribute to the formation of the orbital cavity where the eyes are situated, as well as part of the nasal cavity and the hard palate of the mouth.

The zygomatic bones, while important, primarily constitute the cheeks and part of the orbit but are not involved in forming the upper jaw. The mandible is the lower jawbone and does not contribute to the upper jaw structure. The temporal bones are located on the sides of the skull and involve the area around the ears, but they do not form part of the upper jaw or the structures mentioned in the question. Thus, the unique contributions of the maxillae to several facial structures make it the correct answer.