orbitomeatal line


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Related to orbitomeatal line: orbitomeatal plane, intraorbital

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.

base·line

(bās'līn)
1. A line approximating the base of the skull, passing from the infraorbital ridge to the midline of the occiput, intersecting the superior margin of the external auditory meatus; the skull is in the anatomic position when the baseline lies in the horizontal plane.
Synonym(s): orbitomeatal line.
2. Level of performance or aggregate findings before initiation of therapy.

base·line

(bās'līn)
1. A line approximating the base of the skull, passing from the infraorbital ridge to the midline of the occiput, intersecting the superior margin of the external auditory meatus.
2. Level of performance or aggregate findings before therapy.
Synonym(s): orbitomeatal line.
References in periodicals archive ?
The plane for CT scanning of paranasal sinuses was kept parallel to inferior orbitomeatal line (Reid's baseline) starting at the level of maxillary alveolus just below the hard palate and to end above the level of frontal sinus.
* CT scan was performed keeping patient's head in supine position for axial projection with gantry and angle tilt 0[degrees]-10[degrees] in reference to orbitomeatal line, scanning through orbital region.
Plan of Section: 10-25 degree to Reids line or parallel to orbitomeatal line. Continuous axial sections of slices thickness 5 mm were taken for posterior fossa and 10 mm for supratentorial regions.