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hindbrain
hindbrain The hindbrain is the backmost of the three early brain regions in the embryo.
The hindbrain is the backmost of the three early brain regions in the embryo. It includes the myelencephalon, metencephalon, and isthmus rhombencephali, and it develops into major brainstem structures including the medulla oblongata, pons, cerebellum, and the cavity that becomes the fourth ventricle.