The more caudal myelencephalon will become the medulla. The medulla oblongata forms in fetal development from the myelencephalon. During embryonic development the medulla oblongata develops from the myelencephalon. The myelencephalon gives rise to the medulla oblongata. The brain stem or myelencephalon is the brain's posterior. The metencephalon becomes the pons and the cerebellum, and the myelencephalon becomes the medulla oblongata. The brain stem (or myelencephalon) is the brain's posterior. The myelencephalon is made from rhombomeres r2 to r11, which also form the medulla.