Following the pioneering research by His (1890), Salvi (1897) and Kolliker (1896) on the differentiation of the neural tube, many researchers studied particular aspects of cellular development in neuroepithelium. According to His’ theory, the neuroepithelium is heterogeneous in nature, and the spongioblasts in their ventricular site gradually move away from one of the bordering membranes and assume the cellular nature of astroblasts, astrocytes, oligodendroblasts or oligodendrocytes. The spongioblasts which remain connected to the internal membrane form the future ependymal cells.
KeywordsNeural Tube Spinal Ganglion Ventral Portion Posterior Root Anterior Root
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