Liz, necks tie in both at the bottom and the top. I think what Lynn was referring to is that the topline of the neck should "tie in" as far as possible behind the withers. Some horses look like their necks sprout out of the front on the withers, i.e. they have a neck, then a dip, then withers, then a back. A well-conformed horse has no dip in front of the withers because his neck ties in well. This is important because in order for a horse to collect up well, they have to be able to coil their topline. The muscles in the top of the neck connect to the backwards-pointing spines of the withers so that contracting those muscles raises the back. A horse who can't do that can't collect easily because the leverage system of the neck is sort of disconnected. Sorry that's not a very clear picture, but the point is that yes you misinterpreted Lynn's post! LOL
Leia