Chapter 3: Ventricular System Flashcards
Map out the flow of CSF through the brain.
Refer to the diagram.
Choroid plexus
contains choroid epithelial cells and is in the lateral, third, and fourth ventricles. Secretes CSF and tight junctions form blood- CSF barrier
How does CSF enter into the venous circulation?
passing through arachnoid granulations into dural venous sinuses
What is a noncommunicating hydrocephalus?
obstruction of flow within ventricles; most commonly occurs at narrow points, e.g., foramen of Monro, cerebral aqueduct and/or openings of fourth ventricle
What is a communicating hydrocephalus?
impaired CSF reabsorption in arachnoid granulations or obstruction of flow in subarachnoid space
What is normal pressure (chronic) hydrocephalus? Symptoms?
CSF is not absorbed by arachnoid villi (a form of communicating hydrocephalus). CSF pressure is usually normal. Ventricles chronically dilated.
Produces triad of dementia, apraxic (magnetic) gait, and urinary incontinence.
Rx: Peritoneal shunt
Ex vacuo hydrocephalus?
descriptive term referring to excess CSF in regions where the brain tissue is lost due to atrophy, stroke, surgery, trauma, etc. Results in dilated ventricles but normal CSF pressure.
