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10 Cards in this Set
- Front
- Back
define meninges |
thick dense connective tissue located b/w bone & nervous tissue |
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name the 3 layers of meninges |
dura mater: thick connective tisssue arachnoid mater: looks like spiders web, fills in space pia mater: shiny stuff (follows brain's contours) |
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name the 3 extensions of the dura mater |
1. falx cerebri: separates L&R 2. falx cerebelli: separates L&R of cerebellum 3. tentorium cerebelli: separates cerebellum & cerebrum |
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what is CSF? |
cerebrospinal fluid: clear colourless fluid in brain & spinal cord |
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how is CSF made? |
made by the choroid plexus (capillaries & ependmal cells) 1. ependymal cells pump Na+ & other solutes into ventricles 2. concentration gradient 3. draws plasma into ventricles by osmosis |
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how is CSF drained? |
via venous system --> through arachnoid villi |
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what is the FXN of CSF? |
1. mechanical protection (buoyancy & shock absorption) 2. contributes to healthy extracellular environment for neurons (90% H2O, Na+ [solutes]) 3. exchange of nutrients & removal of waste products from CNS |
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what is the BBB? |
lining of blood vessels in CNS * 2 carotid arteries * 2 vertebral arteries (which travel thru the transverse foramen of cervical vertebrae) * jugular vein |
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how do astrocytes form the BBB? |
arms of astrocytes sit next to endothelial cells secretes paracrines for production of tight junctions |
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what is the function of BBB? |
1. chemical protection of CNS (protecting brain from fluctuations in blood) 2. regulation of substances that can cross BBB (like the phopsholipid bilayer) 3. a weaker BBB for pituitary gland/vomiting center |