lecture 21 Flashcards
the separations of the layers of the dura mater are called
venous sinuses
5 features of the dura mater
1: outermost meningeal layer
2: dense and fibrous
3: an inner and outer layer
4: the space of the layers is a venous sinus
5: the inner layer forms dural folds
what are the three dural folds and what do they do
the dural folds are the Falx cerebelli, the falx cerebri the tentorium cerebellum. these separate major brain hemispheres providing support within the brain.
what does the Falx Cerebri separate
falx cerebri separates the two hemispheres of the cerebrum
what does the Falx Cerebelli separate
Falx cerebelli separates the two cerebellar, cerebellum, hemisphere
what does the tentorium cerebelli separate
the tentorium separates the cerebrum from the cerebellum
what are the venous sinuses known as and what do they do
they are known as collecting veins and they They collect a) Venous blood from the brain
b) ‘Old’ CSF after it has cycled through the
ventricular system
what is the subarachnoid space
the space between the pia mater and the arachnoid mater
what is found in the arachnoid mater
Cerebrospinal fluid and blood vessels, these vessels sit on top on the pia mater
what are arachnoid granulations and what do they do
arachnoid granulations are parts of the arachnoid mater that perforates the venous sinuses. the arachnoid granulations transport old nutrient depleted CSF into the venous sinuses
what are the ventricles lined with and what do these cells do
the ventricles are lined by ependymal cells which have cilia which allows them to circulate CSF in the ventricular system
what does cerebrospinal fluid do
it provides nutrients to the brain and provides protection
what makes the CSF
the choroid plexus, which is within the ventricles
where are the lateral ventricles found
one lateral ventricle is found in each hemisphere of the cerebrum
where is the third ventricle found
at the diencephalon
