Not a normal variant of intracranial venous drainage:-
Abnormal variant: - Median prosencephalic vein: - Formation of vein of Galen got compromised. d/t aerio-venous fistula Dural venous sinuses: - Internal cerebral vein (draining blood around the brainstem) joins with basal vein of Rosenthal to form the great vein of Galen. Great cerebral vein (vein of Galen) joins with inferior sagittal sinus to form straight sinus, which drain into confluence of sinus. Confluence of sinus - 3 incomings: Mnemonic - SOS (draining into confluence) anteriorly - straight sinus below - occipital sinus superiorly - superior sagittal sinus This confluence drains into Right & left transverse venous sinuses | Sigmoid sinuses | IJV
Inferior sagittal sinus
Median prosencephalic vein
Occipital sinus
Marginal sinus
JIPMER 2018