In anatomy, relating to the basion (the midpoint of the anterior margin of the foramen magnum) and the nasion (the point where the nasal bones meet the frontal bone).
From 'basion' (Greek 'basis' + '-ion') + 'nasion' (from 'nasus', Latin for nose) + '-al'. Anatomical term combining two skull landmark measurements.
Anthropologists measure the basinasial distance to understand skull shape variations across human populations—it's a tiny measurement that reveals big evolutionary stories!
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