Frankfort Horizontal plane (auriculo-orbital plane)

 established at the World Congress on Anthropology in Frankfurt, Germany in 1884.

a line extending from the most inferior part of the orbital margin to the left tragion (the tragion is the deepest point in the notch superior to the tragus of the auricle); for length and height measurements, when the head is positioned correctly, the subject’s line of sight is parallel to the headboard; also called Frankfort horizontal plane.

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