Protexction Of The Brain Flashcards
Falx cerebri
Folds inward between l and r cerebral hemispheres
Dura
Adheres closely to the bones of the skull
Inward folds help prevent rotational displacement
Large blood vessels enter here the process to smaller sized ones in pia
Tentorium
Folds down/in between cerebrum and cerebellum
Subdural space
Is below the dura mater -blood vessel come thru-if rupture -blood
Subdural hemtoma
Blood looks with Subdural space causing pressure swelling disrupting Brian tissue
What does csf do
Remove toxins and keep brain boyant
Arachnoid
2nd layer
Weblike tissue extending between dura mater and down into folds/dulcimer of brain
Subarachnoid place
Below arachnoid
Filled with csf
Acts as shock absorber
Subarachnoid hemorrhage
Arachnoid rupture bleeding in space pressure >displace tissue
Pis mater
3rd layer
Is thin and delicate
Contains blood vessels which supply oxygenated blood to the brain
Otherwise fluid should not/cannot permeate
4 cerebral ventricles
Four spaces containing csf
Connects by channels, deep to the cortex
Csf circulates through ventricles
2 laterals ventricles
1 in each cerebral hemisphere (l and r)
Crescent shaped
Drain/connect to the third ventricle via the foramen of Munro
The third ventricle
Vertical
In mid-brain/subcortical
Disk shaped
Drains connects downward to the fourth ventricle via aqueduct of Sylvius
Fourth ventricle
Long narrow downward extending tube through into brainstem
In pins and medulla structures of the brain stem
What is csf
Clear color less fluid involved in cns protection
Produced by choroid plexus within the ventricles
Where is csf
In subarachnoid space around the cerebrum and spinal cord
Circulates through ventricles and into the subarachnoid space
Ina continuous flow around the cerebrum, brainstem, spinal cord
Functions of csf
Regulate pressure within cranium
Provide cushion against blows to the head
Provides floating like effect so that weight of brain does not crush structures, reduces weight if brain insignificantly
Functions of csf
Assists in nourishment if tissue
Assists in removal if metabolic wate products via bloodstream
How does csf get to the subarachnoid space
Circulates from laterals to third via foramen of Munro
Circulates for third to fourth
Via aqueduct of Sylvius blockage cause disruption
Reabsorbed by arachnoid vili, venous sinuses of brain
Key needs of csf
Open flow to prevent accumulation of fluid (hydrocephalus) or swelling and displacement of other brain structures
To Maintain stable volume
Be free of blood cells
Csf problems
Hydrocephalus, encephalitis, hemorrhage
