CHAPTER 2 Flashcards
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The brain is one of the most protected organs in the body due to:
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- The Skull:A bony structure that protects the brain from most injuries.
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- Infants are born with skull bones that can overlap (like tectonic plates)
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allowing easier movement through the birth canal. This is why they have a soft spot
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The brain is surrounded by three protective membranes calledmeninges:
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- Dura Mater:The outermost layer
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tough and durable.
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- This is the tough
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outer layer of the meninges. It’s often compared to the protective blankets used for infants
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- Arachnoid Layer:The middle layer with a web-like appearance.
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- This middle layer is more delicate and gets its name because its structure looks like a spider’s web when viewed in cross-section.
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- Pia Mater:The innermost layer that closely adheres to the surface of the brain.
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Between the arachnoid (middle) and pia mater (inside) is thesubarachnoid space
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which is filled with cerebrospinal fluid (CSF).
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- This is the innermost layer and is almost transparent. It closely adheres to the surface of the brain.
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- Thesubarachnoid spaceis located between the arachnoid and pia mater. This space is filled with cerebrospinal fluid (CSF)
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which helps cushion the brain and spinal cord.
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- Once the nerves exit the protective skull and vertebrae
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they are calledperipheral nervesand have additional layers of connective tissue for protection.
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40
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For a long time
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it was believed that the brain was “immune privileged
