True about great cerebral vein of galen
Great cerebral vein constitutes deep vein system of brain. It drains into straight sinus.
Thalamostriate vein and choroidal vein join to form internal cerebral vein (deep cerebral vein).
Thalamostriate vein and choroidal vein form the great cerebral vein of galen
It forms superficial venous drainage system of brain
Great cerebral vein of galen drains into sigmoid  sinus
Basal vein and deep cerebral vein unite beneath splenium of corpus callosum to form vein of galen