<prompt> Vein of Galen drains into ?Internal Juglar veinExternal Juglar veinStraight sinusSuperior sagittal sinus  <response>: Ans. is c i.e., Straight sinusGreat cerebral vein of Galen is formed by union of two internal cerebral veins.It drains into straight sinus.Is 2 cm long.Its tributeries are internal cerebral vein, basal vein, occipital vein and posterior callosal vein. 