circulation of the brain

Question 1

what artery enters the skull via the carotid canal and passes ant and med thru the cavernous sinus of the sphenoid body

Answer 1

internal carotid a.

Question 2

what are the 2 terminal branches of the internal carotid a

Answer 2

ant cerebral (ant communicating after) and the middle cerebral a

Question 3

what arteries pass thru the transverse foramina of the first 6 cervical vertebrae, perforates the dura and arachnoid to pass thru foramen magnum and unite ant to pons

Answer 3

the vertebral a

Question 4

when the vertebral a unite what a do they form

Answer 4

basilar a

Question 5

what is the vertebrobasilar arterial sys also known as

Answer 5

post circ. of brain

Question 6

what a lies close to the base of the skull, divides into 2 and joins the int carotid a via the post communicating a

Answer 6

basilar a

Question 7

what cerebral a supplies most of the medial and sup surfaces of the brain and frontal pole

Answer 7

ant cerebral a

Question 8

what cerebral a supplies the lat surface of the brain and temporal pole

Answer 8

middle cerebral a

Question 9

what cerebral a supplies the inf surface of the brain and occipital lobe

Answer 9

post cerebral a

Question 10

what is the circle pf willis formed by

Answer 10

post cerebral, post communicating, int carotid, ant cerebral and ant communicating

Question 11

veins draining the brain are tributaries of what

Answer 11

large venous sinuses in the dura mater

Question 12

what vein is the principle vessel to receive blood from the large venous sinuses in the dura mater

Answer 12

internal jugular

Question 13

if the int jugular v is occluded which veins would take over temporarily

Answer 13

angular v, pterygoid plexus and suboccipital veins

Question 14

what are called the sinuses with endothelium lined spaces btw the periosteal and meningeal layers of the dura

Answer 14

dural venous sinuses

Question 15

what lies in the superior border of the falx cerebri

Answer 15

superior sagittal sinus

Question 16

where does the sup sagittal sinus originate and end

Answer 16

originates at crista galli and ends near internal occipital protuberance

Question 17

what is the confluence of sinuses

Answer 17

the junction of the sup sagittal sinus, the straight sinus, the occipital sinus and the transverse sinus

Question 18

where is the inferior sagittal sinus

Answer 18

it runs in the inferior border of the falx cerebri and ends in the straight sinus

Question 19

is the sup sagittal sinus larger than the inferior

Answer 19

yes

Question 20

where is the straight sinus

Answer 20

runs infero-posteriorly along the line of attachement of the falx cerebri and the tentorium cerebelli

Question 21

what is the straight sinus formed by

Answer 21

the joining of the inferior sagittal sinus and the great cerebral vein

Question 22

where is the transverse sinus

Answer 22

leaves the confluence of sinuses laterally along the occipital bones and the posteroinferior angles of the parietal bones

Question 23

what will the transverse sinus become

Answer 23

the sigmoid sinus as they approach the petrous portion f the temporal b

Question 24

which side of the transverse sinus is usually larger

Answer 24

the right side

Question 25

the sigmoid sinus

Answer 25

follows an s-shaped course in the posterior cranial fossa
forms deep grooves in the temporal and occipital b
continues inferiorly to the jugular foramen to become the internal jugular vein

Question 26

where is the occipital sinus

Answer 26

lies in the attach border of the falx cerebelli ending superiorly in the confluence of sinuses

Question 27

with what does the occipital sinus communicate

Answer 27

the internal vertebral venous plexus

Question 28

where is the cavernous sinus

Answer 28

in the middle cranial fossa

situated bilaterally on each side of the sella turcica

Question 29

where does the cavernous sinus extend from

Answer 29

the superior orbital fissure anteriorly to the apex of the petrous portion of temporal bone posteriorly

Question 30

where does the cavernous sinus recieves blood from

Answer 30

sup. ophthalmic vein
inf ophthalmic vein
middle cerebral vein
sphenoparietal sinus

Question 31

where will the cavernous sinus drain

Answer 31

to the superior and inferior petrosal sinus and the pterygoid plexus

Question 32

what does the cavernous sinus contain

Answer 32

internal carotid artery
carotid plexus of sympathetic nerves
abducens n

Question 33

what is ensheathed in the wall of the cavernous sinus

Answer 33

CNIII
CNIV
CNV1 sometimes CNV2

Question 34

where is the superior petrosal sinus

Answer 34

in the anterolateral portion of the tentorium cerebelli
runs from the posterior ends of the veins of the cavernous sinus to the transverse sinus to then curve to form the sigmoid sinus

Question 35

where does the sup petrosal sinus attach

Answer 35

petrous portion

Question 36

where is the inferior petrosal sinus

Answer 36

begins at posterior ends of the cavernous sinus inferiorly

runs btw petrous portion and basilar portion of occipital b

Question 37

where does the inf petrosal sinus drain

Answer 37

the lateral cavernous sinus into the origin of the IJV

Question 38

basilar plexus

Answer 38

connects inf pertrosal sinus to internal vertebral venous network

Question 39

emissary veins

Answer 39

connect dural venous sinuses with veins outside the cranium

Question 40

the dural venous sinus

Answer 40

arachnoid granulation:
collection of arachnoid villi
prolongation of the arachnoid the protrude through the meningeal layer of the dure into the dural venous sinuses

Question 41

what will arachnoid granulation affect

Answer 41

transfer of csf to the venous system

Question 42

where is arachnoid granulation found

Answer 42

in areas of the sup sagittal and transverse sinus

Question 43

what is the arachnoid granulation adapted for

Answer 43

to transport csf from the subarachnoid space to the venous system