Fig. 6.

Geometry of WM blood supply. a) Contrast-enhanced X-ray of adult human arterial supply in a coronal brain slice including periventricular WM, approximately covering the area outlined by the yellow box in (b). Notice the long, thin arteries supplying the deep WM. Figure reproduced with permission from (Okudera et al., 1999). b) Schematic of deep medullary drainage, coronal view. Notice the long thin veins, and their fan-shaped pattern of increasing density towards the large draining veins surrounding the ventricles. The yellow box indicates the field of view of the image shown in a). Figure reproduced with permission from (Ruiz et al., 2009).