<prompt> Tributaries of cavernous sinus are all except ?Inferior cerebral veinCentral vein of retinaSphenoparietal sinusSuperior cerebral vein  <response>: Ans. is d i.e., Superior cerebral veinTributaries incoming channels of cavernous sinusSuperior ophthalmic veinA branch of inferior ophthalmic vein or sometimes vein itselfCentral vein of retina it may also drain into superior ophthalmic veinSuperficial middle cerebral veinInferior cerebral veinSphenoparietal sinusFrontal trunk of middle meningeal vein it may also drain into pterygoid plexus or into sphenoparietal sinusDraining channels communications of cavernous sinusInto transverse sinus through superior petrosal sinusInto internal jugular vein through inferior petrosal sinus and through a plexus around the ICAInto pterygoid plexus of veins through emissary veinsInto facial vein through superior ophthalmic veinRight and left cavernous sinus communicates with each other by anterior and posterior intercavernous sinuses and through basilar plexus of veins 