lecture 7: circualtion brain Flashcards
what are the 2 main arteries we talk about
internal carotid
vertebral
where is the middle meningeal located and what does it supply
near the temple
supples the superficial dira matter
what does the common cartoid split into
internal cartoid
external carotid
what is the pathway for the interal cartoid
through tthe carotid canal, the petrous portion and tthe foreman lacerum
where does the vertebral artery pass
through the transvere foramen of the first 6 cervical vertabra
the interal carotid is a division from the what
fivision from the common carotid artery
where does the internal carotid enter the skull
via the carotid canal
the internal carotid artery passes anteriorly and medially thorugh what
the cavernous sinus of the sphenoid body
what are the terminal brances of the int cartoid arttery
anterior cerebrlal
middle cerrebral
what are the two anterior ceberals connected by
anterior communicating artery
where do the vertrbral arteries perforate
throuh the dura and arachnpid to pass through the foramen magnum
the vertebral arteries end up in what space
subarachnod space
where to the 2 vertebral arterios unite and what do they form
unite anterior to pons to form basilar
what do the vertebral arteries unite to form
basilar
what is it called when the vertebral artery and basically artery meet
the vertebrobasilar arterior system
what is the vertebrobasilar arterior system also known as
posterior circulation of the brain
what complex does the posterior circualtion of the brain
vertebrobasilar
where does the basilar artery lie
lie close to the base of the skull
what does the basilar artery divide into
the 2 posterior ceberal arteries
where do the psoterior cerebral arteies join and how
at the internal carotid via the posterior commnicating arteries
know the circule of willis
l
what are the 3 cerebral arteries
anterior
posterior
middle
what does the atnerior cerebral artery supple
supplies most of the medial and superior surfaces of the brain and frontal pole
in what fissure do the anterior cerbral arteireis pass
pass on top of corpus callosum
in long fissue
what do the middle cerebral arteries supple
the lateral surface of the brain and temporal pole
what fissure do tthe middle cerebral pass through
towards lasteral fissure on top of insula
what do the posterior cerebrals supply
supply the intefeior surface of the brain aand occitial pole
what fissure does the posterior cerebral artery pass near
the transver fissuer
what creates an important anastomosis at the base of the brain
circle of willis
what does the circle of willis provife
an important anastomosis
offers different paths
what arteries form tthe circle of willis
posterior cerebral posterior communicating anterior cerebral anterior communicating internal carotid
true or false; the middle cerebral artery forms part of the circle of willis
no it does not
what structuress lie near the circle of willis
the sella turcica (pituitary)
cavernus sinus
optic neve and chiasm
veins drianing the brain are tribuutairs of what
the large venous sinuese
where are venous sinuses located
in the dura matter
what is different between venous sinuses and veins
venous sinuese are a foxied dinamater (they have no tunica media (no msucle))
what is the main vein receiving blood from the venous sinuses
internal juglar vein
what are some branches that offer collateral circulation if the jugular is occluded
angular vein, pteyrgoid plexus and suboccipital veins
what are the dural venous sinuses
they are endothelium lined spcaes between the periosteal and meningeal layers of the dura
the venous sinuses lie bwteen what
between the periosteal and meningeal layers of the dura
large viens from the surface of the brain emtpty into what
dural venous sinuses
where does the superior sag sinus lie
lies in the superior border of the falx cerebri
where does the superior sagtial sinus orginiate and end
origitnate at the crista galli and ends near the internal occipital protuberance
what is the confluence of sinues
sup sagital sinus
straigt sinus
occipital sinus
tranverse sinus
the superior sagital ends at what junction
conflucence of sinuses
the inferior sagital is larger than the superior sagital
false, it is much smaller
where does the inferior sagital run
run in the inferrior border of the falx ceberei and terminates in the strigaht sinus
where does the inferior sagtinus terminate
the straight sinus
what is the straight sinus fromed by the joining o
the inferior sag and the great cerebral vein
where does the straight sinus run
infero=posteriorly along the line of attachment of the falx cerebri and tentorium cerebelli
true or false: the straight sinus will join the confluence of sinuese
true
what determinest he junction between inf sagitall and straight sinus
great ceberal vein
the straight sinus is on top of the….
tentorium cerebelli
how does the transverse sinus leave the confluece of sinuses
latarelly along the occipital bones and posteroinferior angles of the parital bones
what the the trainsverse sinus become as they approach the petrous portion of the temporal bones
sigmoid
what transvere sinus is larger and why
the right is larger because the superior sag usually drains to the right
the sigmoid sinus follows what shaped course
s shaped course
the sigmoid sinus follows an s shaped crouse in the …
posteiror cranial fossa
the signmoid sinus forms deep grooves in what
in the temporal and occpital bones
the sigmoid continues INF/SUP to the jugalr formate to become the blan k
inferior to become the internal jugalar vein
where does the occipital sinue lie
in the attached border of the falx cerbelli ending superiorly in the confluences of sinue
true or false: the occipital sinus ends inferior in the confluecne of sinuses
false, superior
what does the occipital sinus communicate with
with the internal vertebral venous plexus
where is the cavernous sinus located (fossa)
in the middle cranial fossa
the cavernous sinue is located on the middle cranial fossia situated bilarterially where
on each side of the sell turcisa
what does each compartent next to the sella turcica contain
the carvenous sinuese
where does the cavernous sinue extend from
from the sup orbital fisse anteriorly to the apex of the petrous portion of the temporal bone posteriorly
the cavernous sinue receives blood from what
sup ophthamic vein
inf opjthalamic vein
middle cerebral vein
sphenopartietal sinus
where does the cavernous sinus drain
drain to the supior and inferior petrosal sinus (postero inferiorly) and to the pterygoid plexus
what are the contents of the cavernous sinus
internal carotid arteru
carotid plexis of sympathic nerves
abducens nerve
what are ensheated in the lateral wall of the cavernous sinus
occulomotor (III)
trochealr (IV)
trigeminal (CV1 and cV2)
where do the superior petrosal sinus run
run from the posterior ends of the veins of the cavernous sinus to the transverse sinus to then curve to form the sigmoid sinus
where does the sup. petrosal sinus lie
in the anterolateral portion of the tentorium cerebelli
where does the superior petrosal sinus attach
attaches to the petrous portion of the temporal bone (on top of petrous)
where does the inferior petrosal sinue begin
beins at the posterior ends of the veins of the cavernous sinus inferiorly
where does the innferior petrosnal sinus run
between the [etrous portion of the temporal bones and the basilar portion of the occipital bone
what does the inferior petrosla sinus drain
drains the lateral cavernous sinus directly into the orgin of the IJV
what dose the basilar plexus connect
connects inferior petrosal sinus to the internal vertebral venous network
what do the emissary veins connect
connect dural venous sinuses with the veins outside the cranial
the dural venous sinuses contains what
arachnoid granulation (collection of the arachnoid villi)
what is the arachnoid granulation
collection of arachnoid villi
prolongation of arachnoid that protrude thorugh the meningeal later of the dura into the dural venous sinuses
what will the arachnoid granulations affect
affect the transfer of CSD to the venous system
where are arachnoid granulations suually found
usually found in areas of the sup sag and transverse sinue
how are the arachnoid granualtations adapted
they are srtcutually adapted to transport CSF from the subsrachnoid space to the venous system
know the midterm chart
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