Examlex
Which of the following is NOT part of a country's party 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.
Superficial Meningeal
Relating to the meninges, specifically the outer layer that covers the brain and spinal cord.
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