Reid’s base line:
It is represented by a horizontal line which extends posteriorly from the lowest point of the infra-orbital margin through the centre of the external acoustic meatus.
The cerebrum lies entirely above this line, whereas the cerebellum occupies the area immediately below the posterior third of this line.
Horizontal views (sections) of C.T. scan or M.R.I. of the brain are made by superimposed lines parallel to the Reid’s base line to represent the levels of images.
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