NEUROANATOMY - CSF

Question 1

What structure produces CSF?

Answer 1

1. Choroidal plexus (70%) located in each ventricle
2. Other brain capillaries (30%)

Question 2

What is normal CSF volume?

Answer 2

130ml

Question 3

What is normal ICP?

Answer 3

5-15mmHg (10-20cm H20)

Question 4

What is normal CSF production per day? How many times is CSF turned over in a day?

Answer 4

1. 550mls per day
2. 4 times turned over per day (130ml volume, 550mls produced per day)

Question 5

What are the different ventricles in the brain? (4)

Answer 5

Lateral ventricles (x 2)
(Interventricular foramen of Munroe)
Third ventricle
Fourth ventricle

Question 6

What is the structure of the lateral ventricle?

Answer 6

Paired C shaped chambers in each cerebral hemisphere, largest ventricle and lies below the corpus callosum

Question 7

What is the function and structure of the interventricular foramen of Monroae?

Answer 7

Communicate between lateral and 3rd ventricles (paired)

Question 8

Where does the third ventricle lie?

Answer 8

Midline, narrow space betwen the L and R diancephalon underneath the lateral ventricles.

Question 9

What is the cerebral aqueduct? (mesencephalic aqueduct, aqueduct of Sylvius)

Answer 9

Located in the midbrain and connects the 3rd and 4th ventricles.

Question 10

Where is the fourth ventricle?

Answer 10

Lies between the pons/medulla anteriorly and cerebellum posteriorly.

Question 11

What is the flow of CSF? How does CSF get into the bloodstream.

Answer 11

Choroid plexus from lateral ventricle flows through interventricular foramen into third ventricle, joins CSF production from there passes through aqueduct into 4th ventricle and joins CSF production from there.

4th ventricle has median and lateral apertures which connects to the subarachnoid space.

CSF from subarachnoid space hit arachnoid granulations which filter through to superior sagittal sinus (how CSF enters bloodstream)