Djangoのadminのurlsは

django.admin.site.urls -> django.admin.site.get_urls

urlpatterns = patterns('',
    url(r'^$', wrap(self.index), name='index'),
    url(r'^logout/$', wrap(self.logout), name='logout'),
    url(r'^password_change/$', wrap(self.password_change, cacheable=True), name='password_change'),
    url(r'^password_change/done/$', wrap(self.password_change_done, cacheable=True), name='password_change_done'),
    url(r'^jsi18n/$', wrap(self.i18n_javascript, cacheable=True), name='jsi18n'),
    url(r'^r/(?P<content_type_id>\d+)/(?P<object_id>.+)/$', 'django.views.defaults.shortcut'),
    url(r'^(?P<app_label>\w+)/$', wrap(self.app_index), name='app_list')
)

    urlpatterns += patterns('',
        url(r'^%s/%s/' % (model._meta.app_label, model._meta.module_name), include(model_admin.urls))
    )