Ventricular System of the Brain and CSF Circulation Flashcards

1
Q

What is the Ventricular System?

A

Intercommunicating Cavities inside CNS

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2
Q

Parts of the Ventricular System

A

Two Lateral Ventricles
Third Ventricle
Fourth Ventricle

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3
Q

Ventricular System is lined with …

A

ependyma

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4
Q

What is ependyma?

A

Glial Cell membrane lining Ventricular System and Spinal Cord Central Canal

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5
Q

What does the Ventricular System contain?

A

Cerebrospinal Fluid (CSF)

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6
Q

Lateral Ventricle
Number of Lateral Ventricles

A

One Right and One Left

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7
Q

Lateral Ventricle
Locations

A

Each situated in the Cerebral Hemisphere

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8
Q

Lateral Ventricle
Communications

A

Communicates with Third Ventricle through Interventricular Formanen of Monro

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9
Q

Lateral Ventricle
Each ventricle is closed medially by the …

A

septum pellucidum

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10
Q

Third Ventricle
Location

A

Between the two Thalami

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11
Q

Third Ventricle
Anterior Communications

A

With Lateral Ventricles through Interventricular Formen

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12
Q

Third Ventricle
Posterior Communications

A

With Fourth Ventricle through Cerebral Aqueduct

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13
Q

Third Ventricle
Roof

A

Tela Choroidea which projects 2 Choroid Plexuses

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14
Q

Third Ventricle
Lateral Wall

A

2 Thalami

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15
Q

Third Ventricle
Floor

A

Optic Chiasma
Infundibulum of Pituitary Gland
Mammillary Body
Tegmentum

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16
Q

Third Ventricle
Posterior Wall

A

Pineal Body
Tectum

17
Q

Fourth Ventricle
Location

A

Behind Pons and Upper Half of Medulla

18
Q

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

A

central canal of inferior medulla and spinal cord

19
Q

Fourth Ventricle
Divisions of Roof Structure

A

Upper Part
Lower Part

20
Q

Fourth Ventricle
Components of Upper Part of Roof Structure

A

Superior Medullary Velum
Superior Cerebellar Peduncle

Velum is a thin membranous tissue

21
Q

Fourth Ventricle
Components of Lower Part of Roof Structure

A

Inferior Medullary Velum

22
Q

Fourth Ventricle
What is the Foramen of Magendi?

A

Large Medial Opening in Inferior Medullary Velum

23
Q

Fourth Ventricle
Floor of Fourth Ventricle

A

Formed by Rhomboid Fossa

24
Q

Fourth Ventricle
Openings

A

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

25
Q

What is CSF?

A

Clear, Colorless Filtrate of Plasma

26
Q

Where is CSF produced?

A

Choroid Plexuses

27
Q

What are the Choroid Plexuses formed from?

A

Tuft of Capillaries
Covered by Ependymal Cells

28
Q

Total amount of CSF

A

150 ml

29
Q

Flow of CSF

A
30
Q

What are the classifications of Hydrocephalus?

A

Communicating (Extraventricular)
Non-Communicating (Intraventricular)

31
Q

Communicating Hydrocephalus causes

A

Extraventricular Obstruction causes all ventricles to dilate

E.g. Post Hemorrhagic

32
Q

Non-Communicating Hydrocephalus causes

A

Ventricular Obstruction causes ventricles proximal to obstruction to dilate

E.g. Aqueductal Stenosis

33
Q

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

A

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