However, the situation is more complex, since comparative embryology shows that the length axis of the neural tube ( the primordium of the brain ) has three internal bending points, namely two ventral bendings at the cervical and cephalic flexures ( cervical flexure roughly between the medulla oblongata and the spinal cord, and cephalic flexure between the diencephalon and the midbrain ), and a dorsal ( pontine or rhombic ) flexure at the midst of the hindbrain, behind the cerebellum.
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