Pons are structures that act like a bridge between the medulla and other brain structures.
The medulla oblongata is a network of cell bodies called reticular formation which extends upwards into the midbrain.
It changed the world. It led to the Russian Revolution, the collapse of the German Empire and the collapse of the Hapsburg Monarchy, and it led to the restructuring of the political order in Europe and in other parts of the world, particularly in the Middle East.