A group of dogs had their intact omentum mobilized to the extent that it could be placed directly upon the surface of the brain. It was subsequently shown, both grossly and histologically, that vascular anastomoses developed between the brain and the omentum and that injected material entered the brain via the vessels at the omental-cerebral interface.
Goldsmith HS, Chen W, Duckett SW. Brain Vascularization by Intact Omentum. Arch Surg. 1973;106(5):695-698. doi:10.1001/archsurg.1973.01350170061015