Which cephalometric landmark is located at the most inferior point of the fissure representing maxillary tuberosities?

The pterygoid maxillary fissure (Ptm) is the cephalometric landmark that is situated at the most inferior point of the fissure representing the maxillary tuberosities. This landmark is used in cephalometric analysis to help assess the relationship between the maxilla and other craniofacial structures, and its position is crucial for accurate measurements and treatment planning.

The location of the Ptm is significant because it serves as an important reference point in both orthodontic assessments and surgical procedures involving the maxillary region. Understanding the anatomy and position of the pterygoid maxillary fissure allows clinicians to make informed decisions about intermaxillary relationships and potential treatment needs.

Other choices, such as the posterior nasal spine (PNS), orbitale (Or), and glabella (G), do not represent the inferior point of the fissure relating to the maxillary tuberosities, thus making them less relevant for this specific question about the landmark's location. Each of these landmarks has its own distinct anatomical significance but does not pertain directly to the maxillary tuberosities as the Pterygoid maxillary fissure does.