Auditory canthus line, auditory orbit line, auditory eyebrow line, supraorbital ear line, infraorbital ear line, orbital ear line, canthus ear line, Reid baseline, X-ray photography baseline and human

Auditory canthus line, auditory orbit line, auditory eyebrow line, supraorbital ear line, infraorbital ear line, orbital ear line, canthus ear line, Reid baseline, X-ray photography baseline and human biology baseline. OMBL: also known as ear line. The connection between the external ear hole and the outer canthus of the same eye.

Auditory orbital line (RBL): the connecting line between the external ear hole and the lower edge of the ipsilateral orbit. Parallel to the anatomical horizontal plane, also known as the human biological baseline, and Reid baseline in CT scanning.

Eyebrow line (EML): the connecting line between the external auditory canal and the eyebrows.

SML: Also called supraorbital line. The connecting line between the external ear hole and the upper edge of the ipsilateral orbit.

Suborbital line (IOL): Also known as the orbital ear line. The line between the external ear hole and the lower edge of the ipsilateral orbit.