Measurements of the infraorbital foramen.
3. Distance between the ventral end of the caudal margin of the infraorbital foramen and the orbital margin in the level of the lacrimal foramen; 4. Distance between the ventral end of the caudal margin of the infraorbital foramen and the dorsal end of the frontal process of the zygomatic bone; 5. Distance between the ventral end of the caudal margin of the infraorbital foramen and the rostral end of the alveolar margin of the incisive bone in the level of the first upper incisor tooth; 6. Distance between the ventral end of the caudal margin of the infraorbital foramen and the caudal end of the nuchal crest at the level of the median sagittal plane