Ok, it's been a while I haven't worked in Soft since 3.7 was the latest.
Position your appendage in place, create a nurbs shape from the end of said appendage, project it on to the object you want to blend to, then create your blend from the end of the appendage to your projected curve. Try the automatic setting to begin with, then dick around with it until you have satisfactory results. Sorry I couldn't be more specific with the menu options, I been using Max exclusively for a couple years now. I think there is a good tutorial here on this site, or on Jeremy Birn's site (3drender.com, I think. Hope this helps...