in the inner base of the skull the altitudes of following structures have been determined : planum sphenoidale ( mean 2.34 cm ) , ground of the fossa hypophysialis ( 1.32 cm ) , ground of the middle cranial fossa ( -0.03 cm ) , ground of the posterior cranial fossa ( -2.30 cm ) , upper edge of the os petrosum ( 1.12 cm ) , tuberculum jugulare ( -0.21 cm ) , ground of the meatus acusticus internus ( 0.45 cm ) .
C0149543
the
C0010265
posterior cranial fossa