The midbrain is only about 2 centimeters long and is located at the very end of the medulla. It is the tiniest part of the column, but deserves all due respect as it plays a crucial role in the embryonic development of the future human being
On about the twenty-eighth day of the embryo's intrauterine development, the neural tube divides into three primary vesicles that will later become the brain.
These are the rhomboid brain, the midbrain, and the forebrain. After a few weeks, the secondary cerebral bubble, or hindbrain, which later develops into the bridge and cerebellum, and the medulla oblongata, separates from the midbrain.
And from the forebrain, the cortex-covered cerebral hemispheres and the intermediate brain (hypothalamus, thalamus, etc.) are formed. Thus the midbrain ends up really in the middle and remains the midbrain.