ventricular system Flashcards
The CSF ciruclates constantly from the _______ to the ________ of the brain and drains in the venous sinuses of the skull.
ventricles
surface
CSF circulates _____________ from the ventricles to the subarachnoid space to the venous sinuses of the brain (epidural).
Uniderectionally
4 Ventricles and where they are located.
Two lateral ventricles: located in each hemisphere
3rd ventricle: in midbrain
4th ventricle: between pons and medulla and the cerebellum
Third ventricle is a midline ____ in the diendcephalon
slit
4th ventricle floor is what?
Tegmentum
4th ventricle ceiling is what?
Tectum
CLear colorless fluid, doesn’t contain cells, produced in choroid plexus.
CSF
How much CSF is within and around the brain and spinal cord? how much of that is in the ventricles?
150-200 mL
only 25 mL in ventricles
Trace CSF circulation through ventricles to sinuses.
Lateral ventricles-> 3rd ventricle->4th ventricle->subarachnoid space-> venous sinuses
________ is the source for CSF. It does this how?
Choroid plexus, by filtering blood
True/False: Fenestrated endothelium in choroid capillary allows plasma/fluid through, but blocks cells.
True
Small protrusions of the arachnoid mater through the dura mater. Allow CSF to exit the sub-arachnoid space and enter the blood stream.
Arachnoid granulations
Largest granulations lie along the __________________.
superior sagittal sinus
Smaller arachnoid granulations are called ____.
villi
True/False: Arachnoid granulations act as 2 way valves.
False: one way valves!
If CSF circulation is blocked, CSF continues to be produced, pressure rise, and ultimately ventricles expand, this phenomenon is called what?
hydrocephalus
Hydrocephalus can result from:
Excess production of CSF
Blockage of CSF
Deficiency of CSF reabsorption
In communicating hydrocephalus, the ventricles are still communicating that the blockage is _________.
Outside
Normal pressure hydrocephalus happens mostly in ________ people.
Elderly people
50% of cases an idiopathic intermittent increase in ICP occurs
Presentation: (boone after 8pm: Wet wacky wobbly)
