Use a calculator to approximate the number.(Round your answer to three decimal places.) 
Definitions:
Arachnoid Granulations
Small protrusions of the arachnoid membrane through the dura mater; they allow cerebrospinal fluid to enter the venous system.
Blood-brain Barrier
The blood-brain barrier is a selective barrier that prevents most substances in the blood from entering the brain, protecting it from pathogens and toxins.
Myelin Sheath
Envelope surrounding most axons; formed by Schwann cell membranes being wrapped around the axon.
Circle of Willis
A circular network of arteries at the base of the brain that supplies blood to the brain and surrounding structures.
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