base line

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or·bi·to·mea·tal plane

1. a line approximating the base of the cranium, passing from the infraorbital ridge to the midline of the occiput, intersecting the superior margin of the external auditory meatus; the cranium is in the anatomic position when the base line lies in the horizontal plane and right and left sides are level.
2. a standard craniometric reference plane passing through the right and left porion and the left orbitale; drawn on the profile radiograph or photograph from the superior margin of the acoustic meatus to the orbitale.
Synonym(s): auriculoinfraorbital plane, eye-ear plane, Frankfort horizontal plane, Frankfort plane, infraorbitomeatal plane
Farlex Partner Medical Dictionary © Farlex 2012

base line

An imaginary cephalometric line from the infraorbital ridge through the middle of the external auditory meatus to midline of occiput.
See also: line
Medical Dictionary, © 2009 Farlex and Partners
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