Final answer:
In the paralleling method, the zygomatic process of the maxilla is perpendicular to the image receptor.
Step-by-step explanation:
The zygomatic process of the maxilla is perpendicular to the image receptor in the paralleling method. The zygomatic process is part of the zygomatic arch, a bony bridge on the side of the skull that extends from the area of the cheek to just above the ear canal. It is formed by the junction of two bony processes: the temporal process of the zygomatic bone (cheekbone) and the zygomatic process of the temporal bone. These two processes join together to form the zygomatic arch, and the zygomatic process is oriented perpendicular to the image receptor.