The vertex of the cranium and base of the chin are examples of what type of reference lines?

The vertex of the cranium and the base of the chin serve as reference points often used in anatomical and aesthetic contexts, which relate to positioning and alignment in mortuary science and cosmetology. These reference points indicate locations on the human skull and face that can be visually connected using what are considered imaginary horizontal lines because they help to establish a level or alignment in facial and cranial measurements.

Imaginary horizontal lines are conceptual lines that extend horizontally across the face or cranium, providing a basis for additional measurements or aesthetic considerations, such as alignment in embalming or reconstruction processes. They are called "imaginary" because they are not physically marked but serve as a standard for visual or measurement orientation.

The other types of lines mentioned, such as vertical lines, curved lines, and geometric lines, do not effectively convey the specific application of establishing horizontal alignment in this context. Therefore, these references specifically align with the definition and application of imaginary horizontal lines in the study and practice of mortuary science.