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Reid's base line

Reid's base line
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.
Dorlands/Elsevier l_10/12494723

Reid's base line is used for an unambiguous definition of the orientation of the human skull in 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
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Reid's_base_line". A list of authors is available in Wikipedia.
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