Reid's base line
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Caption = Relations of the [[brain]] and [[middle meningeal artery]] to the surface of the [[skull]]. 1. [[Nasion]]. 2. Inion. 3. [[Lambda]]. 4. [[Lateral cerebral fissure]]. 5. [[Central sulcus]]. AA. Reid's base line. B. Point for trephining the anterior branch of the [[middle meningeal artery]]. C. [[Suprameatal triangle]]. D. Sigmoid bend of the [[transverse sinus]]. E. Point for trephining over the straight portion of the [[transverse sinus]], exposing [[dura mater]] of both [[cerebrum]] and [[cerebellum]]. Outline of [[cerebral hemisphere]] indicated in blue; course of [[middle meningeal artery]] in red. |
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'''Reid's base line''' is used for an unambiguous definition of the orientation of the human [[skull]] in [[X-ray|conventional radiography]], [[computer tomography]] (CT), and [[magnetic resonance imaging]] (MRI) studies.
In 1962, the World Federation of [[Radiology]] defined it as the line between the [[infraorbital]] margin and the upper margin of the [[external auditory meatus]].
With the head upright, it is typically tilted about 7 degrees nose up with respect to the horizontal plane.
==See also==
* [[Frankfurt plane]]
==External links==
* {{eMedicineDictionary|baseline}}
* {{Chorus|00345}}
{{medicine-stub}}
[[Category:Radiology]]