Final answer:
The "zygomatic arch" is a bony arch on the skull's side, formed by the temporal process of the zygomatic bone and the zygomatic process of the temporal bone. It spans from the cheek to above the ear canal and serves as the origin for muscles involved in chewing.
Step-by-step explanation:
The term "zygomatic arch" refers to an elongated, free-standing arch on the lateral side of the skull. This bony structure is critical for the anatomy of the face, providing structural support and serving as an anchor point for facial muscles. It is created by the union of two processes: the temporal process of the zygomatic bone (also known as the cheekbone) at the front, and the zygomatic process of the temporal bone at the back. The zygomatic bone contributes to much of the lateral wall of the orbit and forms the part of the arch closest to the cheek. The zygomatic process of the temporal bone extends from the temporal bone to form the posterior portion of the arch. These two processes come together somewhat like a drawbridge, completing the zygomatic arch which stretches from the cheek area to just above the ear canal.
One of the significant roles of the zygomatic arch is as the origin for major muscles involved in mastication (biting and chewing). For instance, one of the major muscles that elevate the mandible during chewing originates from this arch. Overall, the zygomatic arch not only provides facial structure but also plays a crucial role in the function of eating.