That night my mother had what she considered a wonderful dream. She dreamed of the country of India, where she had never been. There were orange traffic cones and beautiful lapis lazuli insects with mandibles of gold. A young girl was being led through the streets. She was taken to a pyre where she was wound in a sheet and placed up on a platform built from sticks. The bright fire that consumed her brought my mother into that deep, light, dreamlike bliss. The girl was being burned alive, but, first, there had been her body, clean and whole.
The point is that no matter what you choose to do with your body when you die, it won't, ultimately, be very appealing. If you are inclined to donate yourself to science, you should not let images of dissection or dismemberment put you off. They are no more or less gruesome, in my opinion, than ordinary decay or the sewing shut of your jaws via your nostrils for a funeral viewing.
On a day of burial there is no perspective -- for space itself is annihilated. Your dead friend is still a fragmentary being. The day you bury him is a day of chores and crowds, of hands false or true to be shaken, of the immediate cares of mourning. The dead friend will not really die until tomorrow, when silence is round you again. Then he will show himself complete, as he was -- to tear himself away, as he was, from the substantial you. Only then will you cry out because of him who is leaving and whom you cannot detain.