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32 Cards in this Set

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