What are the three McGrigor’s lines?

Line 1

Upper lines: zygomaticofrontal sutures (laterally), upper orbits (centrally) and frontal sinuses

Line 2

Middle line: zygomatic arches (laterally), inferior orbits (medially) and bridge of nose (midline)

Line 3

Lower line: mandibular condyle and coronoid processes (laterally), lateral and medial walls of maxillary antra (medially) and floor of nose / upper teeth (midline)³³

McGrigor’s lines.

What vertical line should be checked?

Midline: nasal septum and mandibular symphysis.