Starting on E11 the telencephalon grew rapidly, forming first a single cavity and then two evaginated lateral ventricles (Fig. 2). At E12 the major subdivisions of the cerebrum including the hemispheres, lateral ventricles, foramina of Monroi, interhemispherical fissure, and anlage of the choroid plexus were visible. However, at this stage of development the neopallial wall and the telencephalic roof were composed of a continuous sheet of columnar cells (Fig. 2B, C) which still had the simple structure of the epithelium forming the neural tube. Morphologically recognizable neurons had not yet appeared.
KeywordsGrowth Cone Basal Lamina Marginal Zone Columnar Cell Ventricular Cavity
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