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Ardila Chapter 5
Neuro Basis chapt 5
23
Anatomy
Graduate
10/04/2009

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Cards

Term
Describe the Lateral ventricles
Definition
(2) Very large; situated at the right and left hemisphere
Term
Descirbe the 3rd Ventricle
Definition
Situated at the right and left thalamus; connected to the fourth ventricle by the cerebral aqueduct
Term
Descirbe the Cerebral aqueduct
Definition
Pathway from the 3rd and 4th ventricles; at the level of the midbrain
Term
What is significant about the hole in the cerebral aqueduct
Definition
Has a hole because the right and left thalamus are interconnected thru the masa intermedia
Term
Describe the interventricular foramen
Definition
It is a hole where the lateral ventricles are connected with the 3rd ventricle by this structure
Term
Name the 3 extensions of the lateral ventricles
Definition
Anterio/frontal horn; posterior/occipital horn; inferior/temporal horn
Term
Why are ventricles important when doing an MRI or CT scan
Definition
They inform the certain level of the brain/provide a landmark when doing MRI/CT scan
Term
Where is CSF produced
Definition
Produced int the choroid plexus (in the walls of the ventricles)
Term
What rate in the CSF produced
Definition
At the rate of 500 ml/day (1/2) liter continous production. 150 ml in the brain
Term
Describe the flow of CSF
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
Term
What kind of solution is CSF and acts as what for the cortex
Definition
Very pure saline soulution that acts as a cushion or buffer for the cortex
Term
What roles do the ventricles play when shaken
Definition
Plays a protective role when shaken
Term
Describe the internal and external circulation of the brain
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
Term
Describe the 2 aperture foramen
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
Term
What does the arachoid granulations/vili function as
Definition
Participating in reabsorbing csf to the veins will go to the blood
Term
What is the superior sagital sinus
Definition
A major vein that drains the blood from the brain
Term
What is hyrdrocephalus
Definition
"water in the brain" is the abnormal buildup of CSF in the ventricles of the brain
Term
What are the 2 forms of hydrocephalus
Definition
Communicationg (non-obstructive hydrocephalus) and Non-communicating (obstructive hydrocephalus)
Term
Describe Communicating/non-obstructive hydrocephalus
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
Term
What are the 3 main characteristics of Communicating/non-obstructive hydrocephalus
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)
Term
Describe non-communicating (obstructive hydrocephalus)
Definition
Caused by blockage in the ventricular pathways thru which CSF flows
Term
Can Hydrocephalus be congenital or acquired.
Definition
Yes, can be congenital or acquired
Term
How much does the brain weigh
Definition
Weighs 3lbs or 1300-1500 grams
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