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10 Cards in this Set

  • Front
  • Back

define meninges

thick dense connective tissue located b/w bone & nervous tissue

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)

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

what is CSF?

cerebrospinal fluid: clear colourless fluid in brain & spinal cord



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

how is CSF drained?

via venous system --> through arachnoid villi

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

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

how do astrocytes form the BBB?

arms of astrocytes sit next to endothelial cells




secretes paracrines for production of tight junctions

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