The Eye and Raised ICP Flashcards
what are meninges?
protective coverings of the brain and spinal cord
what are the three layers of the meninges?
dura mater
arachnoid mater
pia mater
what provides the sensory nerve supply to the dua mater?
CN V
what is enclosed in the dura mater?
the dural venous sinuses
what are the two layers the dura mater splits into around venous sinuses?
periosteal layer (outer) meningeal layer (inner)
what does the pia mater adhere to?
the brain and any vessels entering/leaving
what is found between the arachnoid mater and the pia mater?
the subarachnoid space
what is found in the subarachnoid space?
CSF
blood vessels
how can the subarachnoid space be accessed clinically and why would this be done?
lumbar puncture
to get a CSF sample
where is a lumbar puncture done?
L3/4 or L4/5 levels
when does the subarachnoid space end?
vertebral level S2
what are the four ventricles of the brain?
lateral x 2 (left and right)
third ventricle
fourth ventricle
what secretes CSF?
the choroid plexus in the lateral and third ventricles
what connects the third and fourth ventricles?
the cerebral aqueduct
how is CSF reabsorbed and where?
via arachnoid granulations
into the dural venous sinuses