I work in a single page application that has the following layout:

I use the Backbone.js router to control the elements that are loading onto the screen:
var AppRouter = Backbone.Router.extend({
routes: {
"" : "list",
"content1" : "content1",
"content1/cont3": "cont3"
},
list: function() {
var list = new List().render().$el;
$("#List").html(list);
},
content1: function(){
var cont1 = new Content1().render().$el;
$("#Content1").html(cont1);
},
content3: function(){
var cont3 = new Content3().render().$el;
$("#Cont3").html(cont3);
}
});
Each time I click on a list item in #List, # Content1 is generated, and when I do this in blocks on # Content1, # Cont3 appears.
The problem I am facing is that if for some reason I refresh the page, for example, when the address is localhost / content1; elements in #List disappear.
I want the content in #List to always be present at boot, no matter what the URL may be, as well as the content in # Content1. Is there a way to achieve this using trunk routers?
thank