internal base of skull

internal surface of cranial base

[TA]
the interior aspect of the skull base on which the brain rests; the floor of the cranial cavity.

in·ter·nal base of skull

(in-tĕr'năl bās skŭl)
The interior aspect of the skull base on which the brain rests; the floor of the cranial cavity.
See also: base of skull
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