What is the ruling regarding a Muslim living in a non-Muslim country who donates his body for scientific research after his death? Is it permissible to pray over him given the uncertainty of his burial?

It is permissible to dissect the body of a Muslim for learning purposes if there is a need for it and the body is specified. It is also permissible to donate organs after death. Then, the body should be washed, shrouded, prayed over, and buried.