Two internal cerebral veins fuse to form
The two internal cerebral veins unite together beneath the splenium of corpus callosum to form the great cerebral vein(of GALEN).*After a sho backward course, it joins the Inferior sagittal sinus to form the straight sinus.The tributaries are :Internal cerebral veinsBasal veinsVeins from colliculiVeins from cerebellum and adjoining pas of occipital lobe(Ref: Vishram Singh textbook of clinical neuroanatomy second edition pg-181)
Middle cerebral vein
Anterior cerebral vein
Great cerebral vein
Inferior cerebral vein
Brain 