Blood return from the brain flows to special channels in the skull called ________, which contain no valves and do not have regular venous walls.

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Venous sinuses. Blood return from the brain flows via cerebral veins to special channels within the skull called venous sinuses. Cranial venous sinuses contain no valves, and aside from an endothelial lining, do not have regular venous walls.

Blood Return from the Brain Flows to Special Channels in the Skull