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Vent System & CSF Ob

QuestionAnswer
lateral ventricles - describe and relationship to surrounding brain structures two, not on midline, around corpus colosseum, septum pellucidum, anterior horn body, posterior horn inferior horn inter-ventricular foramen atrium (trigone)
third ventricle - describe and relationship to surrounding brain structures middle of lateral ventricles, posterior and connected to top part of lateral ventricle, more medial
fourth ventricle - describe and relationship to surrounding brain structures below the third ventricle, connected by connected by mesencephalic aquaduct
microscopic anatomy of choroid plexus - layers where substances pass the vascular space and enter CSF roof of each ventricle, made of choroid epithelium, small amounts of connective tissue and capillaries, are fenestrated/leaky, choriod epithelium is united by tight junctions and separates capillaries from CSF in ventricles, majority of CSF produced here
anatomy of blood CSF barrier. Function? tight junctions between choroid epithelial cells, protects CSF from materials found in blood that are harmful to CSF
circulation of CSF from origin to reabsorption made at choroid plexus, circulates through ventricles & central canal, through subarachnoid space via lateral & median apertures of 4th v and around spinal cord and brain, gets reabsorbed with venous blood at arachnoid granulations
anatomy and function of arachnoid villi/granulations tufts of arachnoid, protrudes through dura and into dural sinus, villi~grannulation, many in superior sagittal sinus, 1 way valve from subarachnoid space to sinus, pressure dependent function, CSF absortion is passive, one way,
hydrocephalus high volume of CSF in ventricles, cased by increased production or lowered reabsorption, BIGGEST cause is blockage of circulation
ventricular system CSF, fluid filled system in brain, 4 ventricles in brain and continuous with central canal of spinal cord, continuous with subarachnoid space in 4th ventricle in medulla
CSF production NOT influenced by blood pressure OR pressure of CSF in the ventricles (is influenced by somatic pressure of blood but this isn't as important)
CSF absortion at arachnoid granulations passive process, dependent on pressure gradient, one way process (CSF > venous)
BBB endothelium (capilaries) does tight junctions with astrocytes
B CSF B choroid epithelium does the work
BBB vs BCSFB endothelium vs choroid plexus, choroid plexus is active while arachnoid granulations is passive
Created by: eew888
 

 



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