Figure 3.

Superior view of three-dimensional contrast-enhanced magnetic resonance venogram of two different individuals showing varying areas of drainage to anterior third of superior sagittal sinus, proportional to the length of cortical veins. The posterior limit of anterior third of superior sagittal sinus has been marked with intersection of green line and red midline. (a) Long draining veins (pink arrows) in the anterior third of superior sagittal sinus crossing half the lateral surface of the frontal lobe (marked by 2 red paramedian lines). (b) Short draining veins (pink arrows) to anterior third of superior sagittal sinus, the length limited to the red parallel lines. The posterior limit of anterior third of superior sagittal sinus has been marked with red arrows