<prompt> Vein of Galen drains into-Straight sinusSigmoid sinusinternal jugular veinSuperior longitudinal sinus  <response>: Ans. is a i.e., Straight sinus Great cerebral vein of Galen: It is formed by the union of two internal cerebral veins, is 2 cm long and drains into the straight sinus. Its tributaries are:- a Internal cerebral veins, b Basal veins, c Occipital veins, d Posterior callosal vein 