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. Synonym(s): basis cranii interna [TA], internal base of skull

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