ANATOMY - meninges Flashcards
what is the purpose of meninges
where are they
protects the brain
between the brain and the skull
what is the outermost layer of meninges called, lines the skull
dura mater
what are the two layers of dura mater called
what is between the 2 layers of dura mater
periosteal dura - next to skull
meningeal dura - next to arachnoid mater
dural venous sinuses
CSF (cerebrospinal fluid)
which layer of meninges is the toughest
dura mater (translates to ‘the tough mother’)
which nerve supplies the dura mater with sensory supply
CNV trigeminal
what are the 3 extensions of dura mater
diaphragm sellae
tentorium cerebelli
falx cerebri
where does the diaphragm sella form a roof over
pituitary fossa
what goes through the diaphragm sella
pituitary stalk
what is the diaphragm sella made of
dura mater
what is the tentorium cerebelli made of
dura mater
where is the tentorium cerebelli on top of
cerebellum (little brain)
what goes through the tentorium cerebelli
brain stem
which part of the skull does parts of the tentorium cerebelli attach to
petrous part (ridges) of temporal bone
where is the falx cerebri
between the two cerebral hemispheres
what is the flax cerebri made of
dura mater
what are the 3 attachments of the falx cerebri
internal occipital protuberance (posterior) crista galli (anterior) internal sagittal suture (superior)
where is the subarachnoid space
between the arachnoid mater and the pia mater
what structure is in the arachnoid mater
what is their function
arachnoid granulations
reabsorb CSF back into venous system (dural venous sinuses)
where is the CSF
subarachnoid space
where is the pia mater
right next to brain, follows gyri and sulci so cant see clearly
what is the purpose of CSF
protects/cushions the brain
what is meningitis
why is it painful
inflammation of the meninges
dura is stretched
where are the dural venous sinuses
between the 2 layers of dura
where does blood drain after its been in the dural venous sinuses
internal jugular vein
which vessels pass through the cavernous sinuses
internal carotid ARTERIES
which nerves pass through the cavernous sinuses
CN III, IV, V1, V2, VI
- the eye ones (II, IV, VI) and upper face (V1, V2)
where are they cavernous sinuses
what are they
lateral to pituitary gland
type of dural venous sinuses
where do the cavernous sinuses drain before they go to the internal jugular vein
anterior intercavernous sinus
what clinical problem can affect the cavernous sinuses, due to their location
pituitary tumor
apart from blood from the brain, where else does blood drain into the cavernous sinuses from
what is the clinical significance of this
face - superior and inferior ophthalmic veins
spot/laceration in the danger triangle (around nose area) = bacteria can enter the ophthalmic veins = end up in the cavernous sinuses = meningitis, cavernous sinus thrombosis, brain abscess
where is the confluence of sinuses (dural venous sinus)
back of head, where superior sagittal sinus and transverse sinuses meet
where is the superior sagittal sinus (dural venous sinus)
along middle/top of brain, sagittal plane
which venous sinuses by pass the cavernous sinuses and go straight to the internal jugular vein
superior sagittal , inferior sagittal,
go to confluence of sinuses then internal jugular vein
