Cerebro Spinal Fluid

Question 1

How many ventricles are in the brain? List…

Answer 1

There are 4 ventricles within the brain, these include:
Lateral ventricles (2),
3rd ventricle, &
4th ventricle.

Question 2

Provide a brief description about the lateral ventricles (including anatomical location).

Answer 2

The lateral ventricles (2) are the largest of the ventricles in the brain.
They follow the caudate nucleus medially forming two large C shaped structures. The lateral ventricles sit inferior to the corpus callosum. The lateral ventricles are connected to the third ventricle via the Interventricular foramen (of Monroe), shown in red.
The lateral ventricles contain chorid plexus cells which produce CSF.

Question 3

Provide a brief description about the third ventricle (including anatomical location and connections).

Answer 3

The third ventricle lies between the right and left diencephalon (thalamus & hypothalamus). It has connections to the lateral ventricles superiorly via the Interventricular foramen and inferiorly to the fourth ventricle via the aqueduct of Sylvius (cerebral aqueduct, mesencephalic aqueduct).
Contains chorid plexus cells which produce CSF.

Question 4

When considering the ventricular system, detail the brain structures that surround each component:
1. Lateral ventricles
2. Third ventricle
3. Aqueduct of Sylvius
4. Fourth ventricle

Answer 4

1. The lateral ventricle is medial to the caudate nucleus, following its C shaped structure. It lies inferior to the corpus callosum and is a telencephalic structure.
2. The third ventricle lies medial to the right and left diencephalon (thalamus and hypothalamus).
3. The aqueduct of Sylvius lies medial within the midbrain and connects the third and fourth ventricle.
4. The fourth ventricle is located medially within the pons and upper medulla.
5. The aqueduct of

Question 5

Where is CSF produced?

Answer 5

CSF is produced by choroid plexus (collections of specialised ependymal cells that filter blood plasma components and produce CSF). Choroid plexus locations include the lateral ventricles, third and fourth ventricles.

Question 6

What is the names of the channels from which CSF leaves the 4th ventricle and enters the subarachnoid space?

Answer 6

CSF leaves the 4th ventricle and enters the subarachnoid space via three channels / apertures. There are two lateral apertures and one median apertures.

Question 7

Label these major dural sinuses

Answer 7