Final answer:
The arrows on the panogram point to a radiopacity that is likely the zygomatic arch, a significant bony structure on the side of the skull.
Step-by-step explanation:
The arrows on the program are likely to be pointing to a radiopacity that represents the image of the zygomatic arch. The zygomatic arch is described as the bony arch on the side of the skull that spans from the area of the cheek to just above the ear canal. It is an important structure that is formed by the union of the temporal process of the zygomatic bone and the zygomatic process of the temporal bone. The zygomatic arch serves as the origin for one of the major muscles that elevates the mandible during biting and chewing.