Assertion: telencephalon's cavity | /r/HasProperty | formed inside the tube
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text: Once the neural tube is closed on both extremes, which happens after the first month after conception, the cavity that is formed inside the tube is surrounded by ependymal cells, that are the cells that will give rise to the different types of neurons of the CNS, whereas the cells of the outer portion of the tube will give rise to all other types of cells.