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13 Cards in this Set
- Front
- Back
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What are the coverings of the brain
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meninges- dura, arachnoid and pia matter.
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Role of CSF
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protection support, buoyancy effect, transport for chemicals proteins, lymphatic.
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monroe kellie
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volume of brain + volume of SAS vessels and ventricle= volume of skull.
MAP-ICP= CPP |
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Virchow robin space
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where microbes get in and thats how you get meningitis.
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Ventricles
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4. 1 n 2 - lateral through foramen of monro to 3rd through sylvius aqueduct to 4th and out of magna through magendie midline and 2 lushka lateral.
25 of 140 of csf here. |
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arachnoid villi
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granulations when visible to naked eye, 1way valves between csf and venous system. requires pressure. venous pressure in sinus needs to be lower than csf.
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CSf production
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70% by choroid plexus which lines the mesial walls of the lateral ventricles the roof of the 3rd and inferior medullary velum of 4th.
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how much csf made per day
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450-500 cc . csf and blood pressure dont effect rate except in extremes. total csf is 150cc. normal pressure is less than 200mm H2O
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non comm
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obstruction prior to or at exit of the 4th ventricle outlet foramne
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Signs and symptoms for hydrocephalus
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headache lethargy vomiting confusion, papilledema enlarging head, 6th nerve palsy, dilated scalp veins.
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cytotoxic edema
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intracellular, BBB is in tact.
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vasogenic edema
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extracell breakdown of BBB . trauma infection
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interstitial edema
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hydrocephalus, increased fluid pressure in ventricle.
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