Ependymal cells line the fluid-filled ventricles, so a drug to activate the cells could theoretically travel through this fluid directly to the stem cells.

• 室管膜细胞排列在充满脑脊液的脑室周围，所以理论上认为药物可以通过这些流动的脑脊液直接到达干细胞部位来活化这些细胞。