frankfurtska ravan

Standard horizontal plane at the level of the upper edge of the opening of the external auditory meauts (external ear opening) and the lower border of the orbital margin (lower edge of the eye socket), when the median plane of the head is held vertically.

Standardna horizontalna ravan u nivou gornje ivice spoljne strane slučnog kanala (spoljnog otvora uha) i donje granice orbitalne margine (donje ivice očne duplje), kada srednja ravan glave stoji vertikalno.

Standardna horizontalna ravan u nivou gornje ivice spoljne strane slučnog kanala (spoljnog otvora uha) i donje granice orbitalne margine (donje ivice očne duplje), kada srednja ravan glave stoji vertikalno.