User blog comment:Morgan silve/Hollows/@comment-1268838-20101101114124

Well, we've seen that Hollow anatomy can be very, very different among individuals. Like I mentioned in another discussion, some of their Hollow holes go straight through areas where essential internal organs would be, yet as Ulquiorra mentioned, Arrancar do have their own. I have no idea what was up with Wonderweiss, but like Rejuvenation said, he was technically in a league of his own.