Term
| Describe the Lateral ventricles |
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Definition
| (2) Very large; situated at the right and left hemisphere |
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Term
| Descirbe the 3rd Ventricle |
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Definition
| Situated at the right and left thalamus; connected to the fourth ventricle by the cerebral aqueduct |
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Term
| Descirbe the Cerebral aqueduct |
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Definition
| Pathway from the 3rd and 4th ventricles; at the level of the midbrain |
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Term
| What is significant about the hole in the cerebral aqueduct |
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Definition
| Has a hole because the right and left thalamus are interconnected thru the masa intermedia |
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Term
| Describe the interventricular foramen |
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Definition
| It is a hole where the lateral ventricles are connected with the 3rd ventricle by this structure |
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Term
| Name the 3 extensions of the lateral ventricles |
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Definition
| Anterio/frontal horn; posterior/occipital horn; inferior/temporal horn |
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Term
| Why are ventricles important when doing an MRI or CT scan |
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Definition
| They inform the certain level of the brain/provide a landmark when doing MRI/CT scan |
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Term
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Definition
| Produced int the choroid plexus (in the walls of the ventricles) |
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Term
| What rate in the CSF produced |
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Definition
| At the rate of 500 ml/day (1/2) liter continous production. 150 ml in the brain |
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Term
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Definition
| It is a continous flow thru the bentricular system into the level of the subarachnoid space and exiting into the venous system by the arachnoid granulations |
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Term
| What kind of solution is CSF and acts as what for the cortex |
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Definition
| Very pure saline soulution that acts as a cushion or buffer for the cortex |
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Term
| What roles do the ventricles play when shaken |
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Definition
| Plays a protective role when shaken |
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Term
| Describe the internal and external circulation of the brain |
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Definition
| Chorid plexuses of 3rd ventricle (produces CSF)-3rd bentricle-blood filled dural space-pia mater-cerbral aqueduct-4th ventricle-sub arachnoid space to reabsorb CSF-thru 2 holes to the arachnoid vili-arachnoid mater-dura mater |
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Term
| Describe the 2 aperture foramen |
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Definition
| Lateral aperture and median aperture foramen:magelin/luria intercerbrally and externalcerebrally of the csf moves the csf in and outside the brain thru the 2 foramen that is locatted in the subarachnoid space |
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Term
| What does the arachoid granulations/vili function as |
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Definition
| Participating in reabsorbing csf to the veins will go to the blood |
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Term
| What is the superior sagital sinus |
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Definition
| A major vein that drains the blood from the brain |
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Term
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Definition
| "water in the brain" is the abnormal buildup of CSF in the ventricles of the brain |
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Term
| What are the 2 forms of hydrocephalus |
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Definition
| Communicationg (non-obstructive hydrocephalus) and Non-communicating (obstructive hydrocephalus) |
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Term
| Describe Communicating/non-obstructive hydrocephalus |
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Definition
| caused by inadequate absorption of CSF when ventricular pathways are not obstructed due to many factors such as infections or trauma. ie normal pressure hydrocephalus associated with frontal lobe dementia |
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Term
| What are the 3 main characteristics of Communicating/non-obstructive hydrocephalus |
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Definition
| Executive functional disturbances, diffficulties walking (glued to floor), difficulties for sphincter control, the enlarged lateral ventricles, the frontal horns are compressed the frontal lobe of the mesial aspect (the legs homocullus are located) |
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Term
| Describe non-communicating (obstructive hydrocephalus) |
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Definition
| Caused by blockage in the ventricular pathways thru which CSF flows |
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Term
| Can Hydrocephalus be congenital or acquired. |
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Definition
| Yes, can be congenital or acquired |
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Term
| How much does the brain weigh |
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Definition
| Weighs 3lbs or 1300-1500 grams |
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