Which point marks the intersection of the internasal and frontonasal sutures?

The point that marks the intersection of the internasal and frontonasal sutures is known as the nasion (N). This landmark is located at the bridge of the nose, where the frontal bone meets the nasal bones. It serves as an important reference point in cephalometric analysis and orthodontic treatment planning.

Understanding the significance of the nasion helps in various applications, such as assessing facial symmetry and growth patterns, as well as determining the relationship between different craniofacial structures. In contrast, the other options refer to different anatomical landmarks: the basion is the midpoint of the anterior margin of the foramen magnum, the sella is the center of the sella turcica, and the porion is the uppermost point of the external auditory meatus. Each of these points has its own distinct relevance in cephalometrics, but they do not represent the specific intersection of the sutures that the nasion does.