Blood Supply & Ventricles

Question 1

Interventricular Foramen of Monroe

Answer 1

Connects the lateral ventricle to the third ventricle; one on each side

Question 2

Cerebral aqueduct

Answer 2

Connects the third ventricle to the fourth ventricle

Question 3

Aperatures

Answer 3

Connect the fourth ventricle with the subarachnoid space

Question 4

Ependyma

Answer 4

A single layer of cells lining the ventricles; these cells lack tight junctions and form a leaky layer which allows the CSF in the ventricles to exchange freely with the ECF in the interstitial spaces of the brain

Question 5

Choroid Plexus

Answer 5

Ventricular tissue specialized for production of CSF

Question 6

How is CSF produced?

Answer 6

Solutes diffuse out of leaky capillaries in the choroid plexus and are actively transported across tight junctions in the ependymal cell to get into the ventricular CSF

Question 7

How much CSF (volume) is located in the subarachnoid space and ventricles? How much CSF is produced every day?

Answer 7

25 mL in the ventricles
100 mL in the subarachnoid space

500 mL produced daily

Question 8

Non-communicating hydrocephalus

Answer 8

Accumulation of CSF within the ventricles, caused by obstruction within the ventricular system

Question 9

Communicating hydrocephalus

Answer 9

Accumulation of CSF within the ventricles, caused by failure of CSF to resorb within the sub-arachnoid space