The rhombencephalon is the most caudal region of the future brain. It first appears on E9 and is further subdivided to the following regions:
Metencephalon- the most rostral part, which appears first on E11 in mouse and gives rise to the pons and cerebellum.
Myelencephalon - which appears first on E11 and gives rise to the medulla oblongata
Spinal cord - which detaches from the other parts of the rhombencephalon on E11.5.
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