The upper portion of the roof is formed by the superior peduncle and the superior medullary velum; the lower portion, by the inferior medullary velum, the epithelial lining of the ventricle covered by the tela chorioidea inferior, the taenia of fourth ventricle, and the obex.
2.
They run backward parallel with one another, between the layers of the tela chorioidea of the third ventricle, and beneath the splenium of the corpus callosum, where they unite to form a short trunk, the great cerebral vein of Galen; just before their union each receives the corresponding basal vein.
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