$scope hierarchy between AppCtrl vs Other Page Ctrls in Ionic?

Let say I have created my project from

‘ionic start test sidemenu’

and I have AppCtrl which seems to be most high-level controller and we have controller per pages, right?

Does that mean AppCtrl is upper hierarchy of other page controllers in Ionic?

just like below

<div ng-controller="AppCtrl">
    <div ng-controller="PageCtrl1">