(Once again we see the importance of fluid flow dynamics in the brain -- if arterial/venous and/or cerebrospinal fluid are encumbered in anyway, then it would make sense that the cilia flow networks cannot transport the messenger substances effectively. CCSVI Alliance)

Interesting --
"Summary: Researchers visualize cilia-based networks in the brain, which could transport vital messenger substances."

"Cerebral fluid, however, has more than just a protective function: It removes cellular waste, supplies our nervous tissue with nutrients, and transports important messenger substances. How these messenger substances are actually being delivered to their destination in the brain, however, was unclear until now."

"In the cerebral fluid of humans, there are hundreds – if not thousands – of physiologically active substances,” Eichele explains. “We are assuming that the network of flows we discovered plays an important role in distributing these substances."

http://neurosciencenews.com/cilia-networks-neuroscience-4641/

Researchers visualize cilia-based networks in the brain, which could transport vital messenger substances.