ventricular system

Question 1

The CSF ciruclates constantly from the _______ to the ________ of the brain and drains in the venous sinuses of the skull.

Answer 1

ventricles

surface

Question 2

CSF circulates _____________ from the ventricles to the subarachnoid space to the venous sinuses of the brain (epidural).

Answer 2

Uniderectionally

Question 3

4 Ventricles and where they are located.

Answer 3

Two lateral ventricles: located in each hemisphere
3rd ventricle: in midbrain
4th ventricle: between pons and medulla and the cerebellum

Question 4

Third ventricle is a midline ____ in the diendcephalon

Answer 4

slit

Question 5

4th ventricle floor is what?

Answer 5

Tegmentum

Question 6

4th ventricle ceiling is what?

Answer 6

Tectum

Question 7

CLear colorless fluid, doesn’t contain cells, produced in choroid plexus.

Answer 7

CSF

Question 8

How much CSF is within and around the brain and spinal cord? how much of that is in the ventricles?

Answer 8

150-200 mL

only 25 mL in ventricles

Question 9

Trace CSF circulation through ventricles to sinuses.

Answer 9

Lateral ventricles-> 3rd ventricle->4th ventricle->subarachnoid space-> venous sinuses

Question 10

________ is the source for CSF. It does this how?

Answer 10

Choroid plexus, by filtering blood

Question 11

True/False: Fenestrated endothelium in choroid capillary allows plasma/fluid through, but blocks cells.

Answer 11

True

Question 12

Small protrusions of the arachnoid mater through the dura mater. Allow CSF to exit the sub-arachnoid space and enter the blood stream.

Answer 12

Arachnoid granulations

Question 13

Largest granulations lie along the __________________.

Answer 13

superior sagittal sinus

Question 14

Smaller arachnoid granulations are called ____.

Answer 14

villi

Question 15

True/False: Arachnoid granulations act as 2 way valves.

Answer 15

False: one way valves!

Question 16

If CSF circulation is blocked, CSF continues to be produced, pressure rise, and ultimately ventricles expand, this phenomenon is called what?

Answer 16

hydrocephalus

Question 17

Hydrocephalus can result from:

Answer 17

Excess production of CSF
Blockage of CSF
Deficiency of CSF reabsorption

Question 18

In communicating hydrocephalus, the ventricles are still communicating that the blockage is _________.

Answer 18

Outside

Question 19

Normal pressure hydrocephalus happens mostly in ________ people.

Answer 19

Elderly people
50% of cases an idiopathic intermittent increase in ICP occurs
Presentation: (boone after 8pm: Wet wacky wobbly)