cranial base

cra·ni·al base

[TA] the sloping floor of the cranial cavity. It comprises both the external base of cranium (external view) and the internal base of cranium (internal view). Synonym(s): basis cranii [TA], basicranium ☆ , base of cranium

cra·ni·al base

(krānē-ăl bās) [TA] Sloping floor of cranial cavity; comprises both external base of cranium and internal base of cranium.
Synonym(s): base of cranium, basicranium.