Please answer this question in your own words:  Q1: What layers make up the meninges? And Why can the circle of Willis maintain perfusion of the brain even if there is a blockage in one part of the structure? Also, Why are ganglia and nerves not surrounded by protective structures like the meninges of the CNS?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Please answer this question in your own words: 

Q1: What layers make up the meninges? And Why can the circle of Willis maintain perfusion of the brain even if there is a blockage in one part of the structure? Also, Why are ganglia and nerves not surrounded by protective structures like the meninges of the CNS? 

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