Which projection is described by the following path: from below the mandible through the vertex of the skull?

Which projection is described by the following path: from below the mandible through the vertex of the skull?

• A. Projection from the chin to the foramen magnum.
• B. Projection from above the skull through the orbit.
• C. Projection from below the mandible through the vertex of the skull.
• D. Projection from the occipital region through the vertex.

Answer: (C)

This path corresponds to the submentovertex projection. In this view, the X-ray beam enters beneath the chin (below the mandible) and travels upward to exit through the vertex of the skull. Positioning places the neck extended so the vertex is near the image receptor, which helps visualize the cranial base and zygomatic arches without much overlap from the mandible or occipital bones. The other described routes—starting above the skull or from the occipital region—would not be entering under the chin and exiting through the vertex, so they describe different projections.

This path corresponds to the submentovertex projection. In this view, the X-ray beam enters beneath the chin (below the mandible) and travels upward to exit through the vertex of the skull. Positioning places the neck extended so the vertex is near the image receptor, which helps visualize the cranial base and zygomatic arches without much overlap from the mandible or occipital bones. The other described routes—starting above the skull or from the occipital region—would not be entering under the chin and exiting through the vertex, so they describe different projections.