Both my MIL and FIL had made arrangements for their bodies to be donated to the local med school. My FIL died some time ago, and my MIL took care of his arrangements before we got there, but my MIL died just a few weeks ago so we've just been through it. They were both in their 90's, and it wasn't unexpected, and they'd both had good lives but were becoming more and more non compos mentis, but still it is sad enough that it was a great relief we didn't have to make any decisions, that they'd done it all for us.
This particular state med school picked up her body at her caretaker's house about 6 hours after she died, and except for signing a few forms and a check that was it from our end. Why a check, you may ask? We had to pay the med school. Not much compared to a funeral of course, but still several hundred dollars. Thought that might surprise some of you who think the med school should be glad to have a free body for their students--it did us--kind of the reverse of the days of body snatching and sales to med schools. I'm not sure if that is always the rule, you paying the med school, but it was here.
Both my MIL and FIL had checked the boxes that they did NOT want the ashes returned to anyone so no scattering. We did have a nice memorial service at their church a month or so later when all the grandkids could make it.
Personally I'm thinking cremation, and I've got a local mtn. top picked out at our family vacation home, that I"ve never been able to climb--want my kids (or grandkids if it's that long from now) to scatter some of them from there, so I can say I made it at last!