The mental protuberance is superimposed by which part of the skull in the SMV projection?

The mental protuberance is superimposed by which part of the skull in the SMV projection?

• A. Nasion
• B. Forehead bone
• C. Mental protuberance
• D. Anterior frontal bone

Answer: (C)

In the SMV (submentovertex) view, the X-ray beam travels from beneath the chin up through the skull base, creating a basal view of the cranial structures. Midline features, like the mental protuberance, end up overlapping with the skull structures that lie in front of or along the same projection path. This overlapping is a characteristic result of the projection geometry, so the mental protuberance appears superimposed by the skull in this view, making it the best answer.

In the SMV (submentovertex) view, the X-ray beam travels from beneath the chin up through the skull base, creating a basal view of the cranial structures. Midline features, like the mental protuberance, end up overlapping with the skull structures that lie in front of or along the same projection path. This overlapping is a characteristic result of the projection geometry, so the mental protuberance appears superimposed by the skull in this view, making it the best answer.