Ventricular System of the Brain and CSF Circulation Flashcards
What is the Ventricular System?
Intercommunicating Cavities inside CNS
Parts of the Ventricular System
Two Lateral Ventricles
Third Ventricle
Fourth Ventricle
Ventricular System is lined with …
ependyma
What is ependyma?
Glial Cell membrane lining Ventricular System and Spinal Cord Central Canal
What does the Ventricular System contain?
Cerebrospinal Fluid (CSF)
Lateral Ventricle
Number of Lateral Ventricles
One Right and One Left
Lateral Ventricle
Locations
Each situated in the Cerebral Hemisphere
Lateral Ventricle
Communications
Communicates with Third Ventricle through Interventricular Formanen of Monro
Lateral Ventricle
Each ventricle is closed medially by the …
septum pellucidum
Third Ventricle
Location
Between the two Thalami
Third Ventricle
Anterior Communications
With Lateral Ventricles through Interventricular Formen
Third Ventricle
Posterior Communications
With Fourth Ventricle through Cerebral Aqueduct
Third Ventricle
Roof
Tela Choroidea which projects 2 Choroid Plexuses
Third Ventricle
Lateral Wall
2 Thalami
Third Ventricle
Floor
Optic Chiasma
Infundibulum of Pituitary Gland
Mammillary Body
Tegmentum
Third Ventricle
Posterior Wall
Pineal Body
Tectum
Fourth Ventricle
Location
Behind Pons and Upper Half of Medulla
Fourth Ventricle
Caudally, the 4th Ventricle is connected to the …
central canal of inferior medulla and spinal cord
Fourth Ventricle
Divisions of Roof Structure
Upper Part
Lower Part
Fourth Ventricle
Components of Upper Part of Roof Structure
Superior Medullary Velum
Superior Cerebellar Peduncle
Velum is a thin membranous tissue
Fourth Ventricle
Components of Lower Part of Roof Structure
Inferior Medullary Velum
Fourth Ventricle
What is the Foramen of Magendi?
Large Medial Opening in Inferior Medullary Velum
Fourth Ventricle
Floor of Fourth Ventricle
Formed by Rhomboid Fossa
Fourth Ventricle
Openings
2 Lateral Openings (Foramen of Luschka)
1 Median Aperture (Foramen of Magendi)
What is CSF?
Clear, Colorless Filtrate of Plasma
Where is CSF produced?
Choroid Plexuses
What are the Choroid Plexuses formed from?
Tuft of Capillaries
Covered by Ependymal Cells
Total amount of CSF
150 ml
Flow of CSF
What are the classifications of Hydrocephalus?
Communicating (Extraventricular)
Non-Communicating (Intraventricular)
Communicating Hydrocephalus causes
Extraventricular Obstruction causes all ventricles to dilate
E.g. Post Hemorrhagic
Non-Communicating Hydrocephalus causes
Ventricular Obstruction causes ventricles proximal to obstruction to dilate
E.g. Aqueductal Stenosis
What are some features of fractures of the middle cranial fossa floor?
Otorrhea - Fluid from external acoustic meatus
Rhinorrhea - Fluid from nose
Causes increased risk of Meningitis
