The Ventricular System

Question 1

Leis on the dorsal surface of the brainstem beneath the cerebellum.

Answer 1

The fourth ventricle

Question 2

On each side of the fourth ventricle, extending toward the lateral margins of the brainstem.

Answer 2

The lateral recess

Question 3

Most of the roof of the fourth ventricle is formed by.

Answer 3

The cerebellum

Question 4

Forms the roof of the caudal part of the fourth ventricle.

Answer 4

Pia and ependyma

Question 5

What is the function of the foramen magendie?

Answer 5

Provides communication between the lumen of the fourth ventricle and the cisterna magna of the subarachnoid space.

Question 6

What forms the rostral part of the roof of the fourth ventricle?

Answer 6

The superior cerebellar peduncles on either side, the superior medullary velum bridged between them

Question 7

What separate the fourth ventricle from the cerebral aqueduct?

Answer 7

The pontomesencephalic junction

Question 8

Narrow channel which passes throughout the length of the midbrain, beneath the superior and inferior colliculi.

Answer 8

The cerebral aqueduct

Question 9

At the rostral margin of the midbrain, the cerebral aqueduct opens into this ventricle.

Answer 9

The third ventricle

Question 10

What forms the lateral walls of the third ventricle?

Answer 10

The thalamus and the hypothalamus

Question 11

Forms the roof of the third ventricle.

Answer 11

Pia-ependyma ( between the stria medullaris thalami )

Question 12

Where does the stria medullaris thalami located?

Answer 12

On the dorsomedial border of the thalamus

Question 13

Located between the column of the fornix and the anterior pole of the thalamus.

Answer 13

The interventricular foramen ( foramen of Monro )

Question 14

What forms the lateral wall of the third ventricle?

Answer 14

The head of the caudate nucleus

Question 15

What forms the roof of the lateral ventricle?

Answer 15

The corpus callosum

Question 16

What forms the medial wall of the lateral ventricle?

Answer 16

The septum pellucidum

Question 17

Separates the anterior horns of the lateral ventricle.

Answer 17

The septum pellucidum

Question 18

Where does the hippocampus located?

Answer 18

In the floor of the inferior horn

Question 19

Its floor formed by the thalamus and tail of the caudate nucleus.

Answer 19

The body of the lateral ventricle

Question 20

Most of the CSF produced by the choroid plexus of this ventricle.

Answer 20

The lateral ventricle

Question 21

From where does the CSF leaves the ventricular system?

Answer 21

Through the three apertures of the fourth ventricle going to the subarachnoid space

Question 22

Most of the CSF passes through this aperture to enter the cisterna magna ( between the medulla and cerebellum ).

Answer 22

The median aperture

Question 23

Lesser amount of the CSF enter the subarachnoid space in the region of the cerebellopontine through this aperture.

Answer 23

The lateral apertures

Question 24

Where does the absorption of CSF takes place?

Answer 24

Primarily in the superior sagittal sinus through the arachnoid villi

Question 25

What are the forces that acts on the CSF to be reabsorbed?

Answer 25

1- The hydrostatic pressure in the subarachnoid space is higher than in the lumen of the sinus.
2- The colloid osmotic pressure is greater in the in the venous blood compared to the CSF.

Question 26

With age the arachnoid villi becomes hypertrophic forming.

Answer 26

Arachnoid granulations