The midpoint between the right and left images in cephalometric analysis is referred to as?

In cephalometric analysis, the midpoint between the right and left images is correctly identified as the median plane. This plane is fundamental in orthodontics and craniofacial analysis as it represents the vertical plane that divides the body into left and right halves. The median plane serves as a reference for evaluating symmetry and for planning orthodontic and surgical interventions.

The median plane is essential for ensuring accurate measurements and comparisons in cephalometric radiographs, as it helps establish a standard point from which other anatomical landmarks can be assessed. This plane allows for the evaluation of the relationship between different dental and skeletal structures.

The other options listed do not serve the same purpose as the median plane. For instance, the Frankfort horizontal plane is an anatomical reference plane used to standardize cephalometric head posture measurements, but it does not refer to the midpoint between right and left images. Similarly, the posterior nasal spine is a specific cranial landmark, and orbitale refers to the lowest point of the orbit; neither relates directly to the concept of a midpoint in cephalometric analysis.