Ventricular System of the Brain and CSF Circulation

Question 1

What is the Ventricular System?

Answer 1

Intercommunicating Cavities inside CNS

Question 2

Parts of the Ventricular System

Answer 2

Two Lateral Ventricles
Third Ventricle
Fourth Ventricle

Question 3

Ventricular System is lined with …

Answer 3

ependyma

Question 4

What is ependyma?

Answer 4

Glial Cell membrane lining Ventricular System and Spinal Cord Central Canal

Question 5

What does the Ventricular System contain?

Answer 5

Cerebrospinal Fluid (CSF)

Question 6

Lateral Ventricle
Number of Lateral Ventricles

Answer 6

One Right and One Left

Question 7

Lateral Ventricle
Locations

Answer 7

Each situated in the Cerebral Hemisphere

Question 8

Lateral Ventricle
Communications

Answer 8

Communicates with Third Ventricle through Interventricular Formanen of Monro

Question 9

Lateral Ventricle
Each ventricle is closed medially by the …

Answer 9

septum pellucidum

Question 10

Third Ventricle
Location

Answer 10

Between the two Thalami

Question 11

Third Ventricle
Anterior Communications

Answer 11

With Lateral Ventricles through Interventricular Formen

Question 12

Third Ventricle
Posterior Communications

Answer 12

With Fourth Ventricle through Cerebral Aqueduct

Question 13

Third Ventricle
Roof

Answer 13

Tela Choroidea which projects 2 Choroid Plexuses

Question 14

Third Ventricle
Lateral Wall

Answer 14

2 Thalami

Question 15

Third Ventricle
Floor

Answer 15

Optic Chiasma
Infundibulum of Pituitary Gland
Mammillary Body
Tegmentum

Question 16

Third Ventricle
Posterior Wall

Answer 16

Pineal Body
Tectum

Question 17

Fourth Ventricle
Location

Answer 17

Behind Pons and Upper Half of Medulla

Question 18

Fourth Ventricle
Caudally, the 4th Ventricle is connected to the …

Answer 18

central canal of inferior medulla and spinal cord

Question 19

Fourth Ventricle
Divisions of Roof Structure

Answer 19

Upper Part
Lower Part

Question 20

Fourth Ventricle
Components of Upper Part of Roof Structure

Answer 20

Superior Medullary Velum
Superior Cerebellar Peduncle

Velum is a thin membranous tissue

Question 21

Fourth Ventricle
Components of Lower Part of Roof Structure

Answer 21

Inferior Medullary Velum

Question 22

Fourth Ventricle
What is the Foramen of Magendi?

Answer 22

Large Medial Opening in Inferior Medullary Velum

Question 23

Fourth Ventricle
Floor of Fourth Ventricle

Answer 23

Formed by Rhomboid Fossa

Question 24

Fourth Ventricle
Openings

Answer 24

2 Lateral Openings (Foramen of Luschka)
1 Median Aperture (Foramen of Magendi)

Question 25

What is CSF?

Answer 25

Clear, Colorless Filtrate of Plasma

Question 26

Where is CSF produced?

Answer 26

Choroid Plexuses

Question 27

What are the Choroid Plexuses formed from?

Answer 27

Tuft of Capillaries Covered by Ependymal Cells

Question 28

Total amount of CSF

Answer 28

150 ml

Question 29

Flow of CSF

Answer 29

Question 30

What are the classifications of Hydrocephalus?

Answer 30

Communicating (Extraventricular) Non-Communicating (Intraventricular)

Question 31

Communicating Hydrocephalus causes

Answer 31

Extraventricular Obstruction causes all ventricles to dilate ## Footnote E.g. Post Hemorrhagic

Question 32

Non-Communicating Hydrocephalus causes

Answer 32

Ventricular Obstruction causes ventricles proximal to obstruction to dilate ## Footnote E.g. Aqueductal Stenosis

Question 33

What are some features of fractures of the middle cranial fossa floor?

Answer 33

**Otorrhea** - Fluid from external acoustic meatus **Rhinorrhea** - Fluid from nose Causes increased risk of Meningitis