MYELENCEPHALON is validvalid

the region of the embryonic hindbrain that develops into the medulla oblongata* [n MYELENCEPHALA]

189,868 of 196,601 in NWL2023·also valid in CSW24

the posterior part of the developing vertebrate hindbrain or the corresponding part of the adult brain composed of the lower part of the brainstem [n MYELENCEPHALA or MYELENCEPHALONS]