Meninges Flashcards
Function of meninges
to stabilize and protect brain and SC
The meninges suspends the ___ from the ___.
brain from skull
The meninges cushion the brain with ___.
CSF
3 layers of meninges
dura matter, arachnoid, pia matter
2 layers of dura matter
periosteal (lines inner surface of skull)
meningeal (faces inward)
2 potential spaces in dura matter
epidural
subdural
Name 2 dural reflection
Falx cerebri
Tentorum cerebri
The falx cerebri (dural reflection) occupies the ___ fissure and separates the _____hemispheres
occupies longitudinal fissure
separates cerebral hemispheres
Falx cerebri attaches anteriorly to ______ and posteriorly to _______/
anteriorly to crista galli
posteriorly to tentorum cerebelli
Tentorum cerevelli separates cerebellum from _____ lobes, making these two compartments:
occipital lobes
supratentorial and infratentorial compartments
Tentorum cerebelli attaches posteriorly to ____ bone and continues to petrous portion of ___ bone.
occipital bone to petrous portion of temporal bone
The ______ is the space in the tentorium cerebelli through which the brainstem passes.
tentorial notch
The falx cerebri and tentorial notch have firm edges, so brain tissue under pressure may ____ under or around these structures.
herniate
Do the dural sinuses have valves?
no
Name the space between arachnoid and pia. This space contains ____.
subarachnoid space. contains CSF
Protrusions of arachnoid into superior sagittal sinus are called ______.
arachnoid villi
Arachnoi villi act as (1 or 2) way valves for CSF
1
Pressure gradient favors flow of CSF from subarachnoid space into _____.
subarachnoid space –> sinuses
T/F
Cerebral arteries run in subarachnoid space
true
___ creates a barrier between CSF and brain.
Pia matter
bleeding from a torn meningeal artery making the potential epidural space a real one:
epidural hematoma
Epidural hematomas usuall have (good or poor) prognoses.
poor
Epidural hematomas are ___ shaped on imaging.
Lens
Tearing of a cerebral vein as it enters sinus can result in _____. __ shaped on imaging.
subdural hematoma
sickle-shaped
Bleeding of arteries into subarachnoid space is known as ______. This is the most common type of hemorrhage.
subarachnoid hemorrhage
2 scales used to rate subarachnoid hemorrhages:
What are they based on?
Hunt and Hess: neuro exam/behavior
Fisher: thickness of layer of blood
