Table 2.

Definition of the forty landmarks used in the study. Landmark numbers correspond to

Landmark #	Landmark definition
1	Anterior nasal spine is the most anterior point of interpremaxiallary suture at base of nasal aperture, midline
2	Nasale is the intersection of nasal bones at rostral point, midline
3	Nasion is the intersection of nasal bones at caudal point, midline
4	Bregma is the intersection of frontal bones and parietal bones at midline
5	The intersection of parietal bones with anterior aspect of interparietal bone, midline
6	The intersection of interparietal bone with squamous portion of occipital bone, midline
7	Opisthion is the midsaggital point on the posterior margin of the foramen magnum, midline
8	Basion is the midsaggital point on the anterior margin of the foramen magnum, midline
9&10	Antero-superior most tip on the nasal bone
11 & 12	Anterior-most point at intersection of premaxilla and nasal bones
13 & 14	Anterior notch on frontal process lateral to infraorbital fissure
15 & 16	Intersection of frontal process of maxilla with frontal and lacrimal bones
17 & 18	Point left of nasion intersection of nasal bone and premaxilla
19 & 20	Intersection of the coronal suture and the temporal crest
21 & 24	Intersection of zygomatic process of maxilla with zygoma (jugal), superior surface
22 & 25	Posterior point at the joining of the squamosal body to zygomatic process of squamosal
23 & 26	Intersection of parietal temporal and occipital bones
27 & 28	Postero-lateral most point on the tympanic bulla
29 & 30	Medial most notch on the tympanic bulla, basicapsular fissure
31 & 32	Most antero-lateral point on corner of the basioccipital
33 & 34	Medial most tip of the tympanic bulla
35 & 36	The posterior-most point on the central anteriorposterior axis of the left molar alveolus
37 & 38	Most posterior point of the anterior palatine foramen
39 & 40	Most anterior point of the anterior palatine foramen