The embryological origin of the CNS is from the '''neural ectoderm''' which is a ridge of tissue in the centre of the early embryo once the basic blastula has undergone a degree of differentiation. The neural ectoderm is formed as the default pathway from ectoderm to neuroectoderm during development. | The embryological origin of the CNS is from the '''neural ectoderm''' which is a ridge of tissue in the centre of the early embryo once the basic blastula has undergone a degree of differentiation. The neural ectoderm is formed as the default pathway from ectoderm to neuroectoderm during development. |