Mummification is an ancient tradition originated from egypt,although many countries have similarities to egypt only a few practise the tradition of mummification.Fun fact, did you know similar to nowadays everyone was allowed to be mummified but only a few could afford the mummification process.
Since the brain decays the easiest the mummifiers usually shove a metal rod and squish all the brain to protect the body from being decayed and eaten from the hungry enzymes that lurk in your body after death.Then they drain the brain out using tree tea and it also plays as a shield to decay.
Secondly, we remove the organs that are useless first like the stomach,liver,intestines,lungs and liver.Then all the important organs remain,so they remove the heart,kidneys etc,and then store them in a jar covered in a special salt that also is a shield to decaying.
Further on, because the outside of the body was decaying they cover the entire body in tree tea and massage the body,then they fully wrap the mummified body in linen and put it in a special tomb.
My opinion is that mummification as a tradition and only tradition is ridiculously smart for people that long ago it should never change as should any tradition.