Term
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Definition
nCavity of the initial neural tube becomes the ventricles
nVentricles serve the brain by producing, circulating, and helping to drain CSF from the CNS
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Term
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Definition
nSpecialized epithelial cells in all ventricles that manufacture CSF
nLacelike structure composed of pia mater
n CSF purposes
1) Suspends the brain/flotation in cavity
2) Bathes neurons and glia
3) Provides route through which chemical messages can be distributed in the nervous system
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Term
CEREBROSPINAL FLUID (CSF) |
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Definition
nLymph like fluid
nClear/colorless
n25-30 ml produced/hour otherwise it’s traveling in SC, around it & around CNS
n100-200 ml within and around the CNS at all times but only 25 ml of that in the ventricles
nDetect elevated pressure in CSF
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Term
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Definition
nCushions the CNS by protecting us from sudden voilent movements
nDecreases the weight of the brain by suspending it in fluid
nWorks with the vascular system to remove waste substances, leaves brain
nSmall amount enters the spinal cord via the central canal but most flows through ventricles and around the CNS
nDiagnostic tool as lumbar puncture
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Term
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Definition
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nLateral- 2
q@ hemisphere level (R/L)
nThird/ 3rd - 1
qBelow lateral
qDiencephalon level
nFourth/ 4th -1
qBelow 3rd ventricle
qPons & medulla level
nInterconnecting chambers in the brain
nIn frontal, parietal, occipital, and temporal lobes
n Choroid plexus in ventricles secrete CSF
n2 lateral ventricles connect to 3rd ventricle via foramen of Munro
n3rd and 4th ventricles connected by Aqueduct of Sylvius
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Term
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Definition
n@ diencephalon level
nForm the floor of hypothalamus
nNarrow at bottom forming the aqueduct
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Term
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Definition
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nLocated btwn pons & medulla, deep part
n(green) lowest chamber
nForamen of Luschka
nForamen of Magendie
qThese 2 foramen drain fluid out into sinus spaces (cisterna magna)
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Term
LATERAL VENTRICLE (not on test) |
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Definition
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nAnterior horn- frontal region
nBody of ventricle- frontal/parietal lobes
nPosterior horn- occipital lobe
nInferior horn- temporal lobes
nAtrium- where body and posterior portion meet
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Term
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Definition
nFrom paired lateral ventricles at level of cerebral hemispheres to
nForamen of Munro to
n3rd ventricle at level of diencephalon to
nCerebral Aqueduct at level of midbrain to
n4th ventricle at level of pons/medulla to
nSubarachnoid cisterns up and around to
nSagittal sinuses to
nSubarachnoid space into
nVenous sinuses back to heart, recycled out of body
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Term
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Definition
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nEnlargement of the ventricles
nDue to:
qExcess production of CSF
qBlockage within system (small foramen!) preventing drainage
nOtherwise push cortex into skull
qFailure of CSF to re-absorb; wrong with venous drainage system, it can’t get out
TREATMENT
nVP Shunt- ventriculo-peritoneal (ventricle à empties into gut)
nICP Monitor
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