Journal of anatomy
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Lateral ventricular coarctation and fusion of the choroid and ependyma was studied in prenatal and postnatal mice. Coarctation of the lateral ventricle was preceded by the presence of a large quantity of extracellular glycogen embedded in an electron-dense, amorphous matrix lying between the ventricular walls. ⋯ The presence of cilia seems necessary for coarctation to occur. Fusion of the choroid plexus with the ependyma appears to be due simply to entanglement of choroidal microvilli and ependymal cilia without any specialised cell to cell connexions being present.