Nervous system - Lecture Twenty One : Neuroanatomy IV - Meninges and ventricular system
5 important questions on Nervous system - Lecture Twenty One : Neuroanatomy IV - Meninges and ventricular system
Explain the features of the Dura Mater meninge ?
- It is the outermost layer.
- Most dense and fibrous.
- Composed of two layers : Outer (periosteal) layer and the inner(meningeal) layer.
DURL FOLDS :
- Formed from the inner layer.
- Separates major divisions of the brain and provides stability.
DURAL REFLECTIONS :
- Falx Cerebri : separates the cerebral hemispheres.
- Falx Cerebelli : Separates the cerebellar hemispheres.
- Tentorium Cerebelli : Separates the cerebellum from the cerebrum.
VENOUS SINUS : collecting vein which collects venous blood and old "CSF" which has been circulated through the ventricular system.
Explain the features of the Arachnoid meninge ?
- Middle layer
- Contains blood vessels but does not extend into sulci
- Below the arachnoid is the sub-arachnoid space which is filled with CSF
- Has arachnoid granulations which perforate the dura mater and facilitates drainage of old "CSF" into the venous sinus.
Explain the features of the Pia mater meninge ?
- Known as the delicate mother
- Inner layer of the meninges
- Transparent and delicate
- Adheres closely to the brain and can extend into sulci
- Blood vessels in the arachnoid sits on top of it
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What is the ventricular system and the locations of ventricles?
LOCATION OF VENTRICLES :
- Lateral : One each on both sides of the cerebral hemisphere
- Third : Diencephalon
- Cerebral aqueduct : Midbrain
- Fourth : At the base level of the cerebellum
What is the Cerebrospinal Fluid (CSF) and explain the circulation pathway ?
- Surrounds the CNS
- Provides support and cushions the brain
- Transports nutrients and waste
- Produced by the choroid plexus within the ventricles
CIRCULATION PATHWAY :
- Starts at the lateral ventricles
- Third ventricle
- Cerebral aqueduct
- Fourth ventricle
- Sub-arachnoid space
- Arachnoid granulation
- Exit through the venous sinus
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