The Ventricular System Flashcards
Leis on the dorsal surface of the brainstem beneath the cerebellum.
The fourth ventricle
On each side of the fourth ventricle, extending toward the lateral margins of the brainstem.
The lateral recess
Most of the roof of the fourth ventricle is formed by.
The cerebellum
Forms the roof of the caudal part of the fourth ventricle.
Pia and ependyma
What is the function of the foramen magendie?
Provides communication between the lumen of the fourth ventricle and the cisterna magna of the subarachnoid space.
What forms the rostral part of the roof of the fourth ventricle?
The superior cerebellar peduncles on either side, the superior medullary velum bridged between them
What separate the fourth ventricle from the cerebral aqueduct?
The pontomesencephalic junction
Narrow channel which passes throughout the length of the midbrain, beneath the superior and inferior colliculi.
The cerebral aqueduct
At the rostral margin of the midbrain, the cerebral aqueduct opens into this ventricle.
The third ventricle
What forms the lateral walls of the third ventricle?
The thalamus and the hypothalamus
Forms the roof of the third ventricle.
Pia-ependyma ( between the stria medullaris thalami )
Where does the stria medullaris thalami located?
On the dorsomedial border of the thalamus
Located between the column of the fornix and the anterior pole of the thalamus.
The interventricular foramen ( foramen of Monro )
What forms the lateral wall of the third ventricle?
The head of the caudate nucleus
What forms the roof of the lateral ventricle?
The corpus callosum
What forms the medial wall of the lateral ventricle?
The septum pellucidum
Separates the anterior horns of the lateral ventricle.
The septum pellucidum
Where does the hippocampus located?
In the floor of the inferior horn
Its floor formed by the thalamus and tail of the caudate nucleus.
The body of the lateral ventricle
Most of the CSF produced by the choroid plexus of this ventricle.
The lateral ventricle
From where does the CSF leaves the ventricular system?
Through the three apertures of the fourth ventricle going to the subarachnoid space
Most of the CSF passes through this aperture to enter the cisterna magna ( between the medulla and cerebellum ).
The median aperture
Lesser amount of the CSF enter the subarachnoid space in the region of the cerebellopontine through this aperture.
The lateral apertures
Where does the absorption of CSF takes place?
Primarily in the superior sagittal sinus through the arachnoid villi
What are the forces that acts on the CSF to be reabsorbed?
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.
With age the arachnoid villi becomes hypertrophic forming.
Arachnoid granulations
