Table 5.

Organization of cortical circulation by zones, according to Duvernoy [52].

Cortical Zone	Description
(1) Deep part of the cortex (layers V–VI)	-Long branches of the main veins located between the cortex and white matter drain the deepest layers of the cortex. -The arteries primarily come from more superficial zones (layers IV and V).
(2) Middle part of the cortex (layer III)	-Arteries and veins quickly divide into numerous branches. -The bush-like venous branches are surrounded by arterial ramifications.
(3) Superficial part of the cortex (layers IIIa-III b-II- I)	-The arterial supply arises from recurrent arteries originating in the middle part of the cortex and curving towards the surface. -The venous drainage is superficial, and it is composed of a large number of type VI and V2 venules, which, following a short course from layers I and II, flow into the pial vessels.