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32 Cards in this Set
- Front
- Back
What are the ventricles?
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Closed system of 4 communicating cavities within the brain, filled with cerebrospinal fluid
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Where does the CSF exit? What space does it fill?
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it exits through the 4th ventricle and fills subarachnoid space
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The three openings in the fourth ventricle for CSF exit and fill subarachnoid space are called what?
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Foramen of Magendie (1)
Foramina of Luschka (2) |
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What are the first two ventricles called?
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lateral ventricles
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Lateral Ventricles- how many are there, what are the boundaries (generally)?
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- 2, one in each lobe
- from anterior horn in the fronal lobe to the posterior portion of the lateral ventricle in the occipital lobe |
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What is the lining of the ventricles made up of?
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pia matter
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Lateral Ventricles- what is the boundary for the roof?
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the roof is the corpus callosum
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Lateral Ventricles- what is the boundary of the floor and the lateral walls?
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the head of the caudate nucleus
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caudate nucleus- what is it?
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-gray matter in the middle of each hemisphere
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the caudate nucleus is part of what?
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the basal ganglia
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What are the holes that lead from the lateral ventricles to the third ventricle?
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Foramen of Monro
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Third Ventricle- what is its general location/boundaries?
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- centrally located
- lateral walls are the 2 thalami (singular thalamus), that make up the biggest part of the Diencephalon |
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How is the 3rd Ventricle connected to the 4th Ventricle?
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by the Cerebral Aqueduct aka Aqueduct of Sylvius
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4th ventricle- what is it's location/boundaries?
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- it is the lowest (most caudal)
- superior boundary=cerebellum - ventral boundary= pons, medulla - completely surrounded by gray matter |
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What is the 4th ventricle continuous with?
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the spinal canal which goes all the way to the lumbar area of the spinal cord
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Choroid Plexus- what is it made of?
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part of arachnoid mater that goes inside ventricles, plus special cells called ependymal cells, lining all parts of the Ventricular system
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What does Choroid Plexus do?
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it manufactures and secretes cerebrospinal fluid
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How is cerebrospinal fluid made?
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a combination of pressure and other properties- blood plasma pushed through capillaries and combines with and includes other substances to make CSF.
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Is CSF manufactured in all the ventricles?
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Yes
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After CSF exits ventricle system where does it go?
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into subarachnoid space.
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What clears CSF out of the system?
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Arachnoid Villi
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Arachnoid Villi is essential for _____________
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the reabsorption of "used up" cerebrospinal fluid
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T or F- CSF is produced continuously?
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T
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What is the total volume of CSF?
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130-150 ml
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In a 24 hr period how much CSF is produced?
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400-500 ml, about 1 tsp per minute
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How often is CSF "turned over"?
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every 6 hours, so about 4 times a day
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What are the two MAJOR roles of CSF?
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Mechanical and Chemical Transport
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What are the mechanical functions of CSF?
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1. shock absorber
2. Buffer System |
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How does CSF work as a shock absorber?
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it provides mechanical support for the brain, the brain and spinal cord are suspended in CSF
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How does CSF work as a buffer system?
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it helps to reduce pressure in the brain. Each time heart beats it pumps blood to brain and the ventricles accomidate the blood supply.l.
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How does CSF provide chemical transport?
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1. It helps to transport chemicals to many parts of the brain
2. regulates effect on chemical composition of extra cellular fluid where neurons and glial cells are bathing |
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What must we remember that CSF does NOT do?
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- it does not supply nutrients
- it is not a lubricant - it doesn't provide insulation (myelin does) |