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EXCI 254 > brain circulation > Flashcards

brain circulation Flashcards

1
Q

entry of internal carotid

A

carotid canal

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2
Q

where does the ICA passes

A

anteriorly and medially through the cavernous sinus of the sphenoid body

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3
Q

what are the terminal branches of ICA

A

Anterior cerebral a.

• anterior communicating artery • Middle cerebral a.

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4
Q

where does the vertebral a. pass through

A

Pass through the transverse foramina of the first 6 cervical vertebraePerforate dura and arachnoid to pass through the foramen magnum

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5
Q

where does the vertebral a. unit

A

Unite anterior to pons to form the basilar artery

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6
Q

which martial system isalso know as the posterior circulation of the brain

A

vertebrobasilar

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7
Q

which artery lies close to the base of the skull

A

basilar

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8
Q

basilar a. divided into

A

Divides into the (2) posterior cerebral arteries

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9
Q

the post. cerebral a. join with which artery

A

join the internal carotid artery (ICA) via the posterior communicating arteries

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10
Q

what does the ant cerebral a. supplie

A

Supplies most of the medial and superior surfaces of the

brain and frontal pole

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11
Q

what does the middle cerebral a. supplies

A

Supplies the lateral surface of the brain and temporal pole

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12
Q

what does the posterior cerebral a. supplies

A

Supplies the inferior surface of the brain and occipital pole

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13
Q

role of circle of Willis

A

Important anastomosis at the base of the brain

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14
Q

which veins is the principle vessel to receive blood from the venous sinus of dura matter

A

internal jugular vein

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15
Q

what those the vein in the brain supplies

A

Veins draining the brain are tributaries of the large venous sinuses in the dura mater

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16
Q

what happens if the jugular become occluded

A

the angular vein, pterygoid plexus and suboccipital veins offer collateral circulation

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17
Q

what is the dural venous sinus

A

Endothelium lined spaces between the periosteal and meningeal layers of the dura

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18
Q

where those the large veins from the surface of the brain empty

A

into dural venous sinuses where they drain all the blood into internal jugular vein

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19
Q

which veins liesin the superior border of the falx cerebri

A

sup sagittal sinus

20
Q

location of sup sagittal sinus

A

Lies in the superior border of the falx cerebri
• Originates at the crista galli and ends near the internal
occipital protuberance at the junction of the confluence of sinuses

21
Q

what empty into the confluence of sinuses

A

sup sagittal sinus, straight sinus, occipital sinus, transverse sinus

22
Q

location of inf sagittal sinus

A

Runs in the inferior border of the falx Cerebri and terminates in the straight sinus

23
Q

what formed the straight sinus

A

the joining of the Inferior Sagittal Sinus and the Great Cerebral Vein

24
Q

location of straight sinus

A

Runs infero-posteriorly along the line of attachment of the falx Cerebri and the Tentorium Cerebelli

25
Q

pathway of transverse sinus

A

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

26
Q

which veins becomebecome the sigmoid sinus as they approach the petrous portion of the temporal bones

A

transverse sinus

27
Q

which one btw right of left transverse sinus is larger

A

right

28
Q

which veinsFollows an S-shaped course in the posterior cranial fossa

A

sigmoid sinus

29
Q

which veins form deepgrooves in the temporal and occipital bones

A

sigmoid sinus

30
Q

pathway of sigmoid sinus

A

Continues inferiorly to the jugular foramen to become the internal jugular vein

31
Q

location of sigmoid sinus

A

posterior cranial fossa

32
Q

location of cavernous sinus

A

middle cranial fossa, on each side of sella turcica

33
Q

which veins is located on each side of sella turcica

A

cavernous sinus

34
Q

pathway of cavernous sinus

A

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

35
Q

cavernous sinus receive blood from and where does it drain it blood

A
  • sup. Ophthalmic vein
  • inf. Ophthalmic vein
  • Middle cerebral vein
  • Sphenoparietal sinus

Will drain to the superior and inferior petrosal sinus (postero-inferiorly) and to the pterygoid plexus

36
Q

what is content in the cavernous sinus

A
  • Internal carotid artery

* Carotid plexus of sympathetic nerves • Abducens nerve (CVI)

37
Q

what is ensheted in lateral wall of cavernous sinus

A
  • Occulomotor nv. ( III)
  • Trochlear nv. (CIV)
  • Trigeminal nv. (CV1 and sometimes CV2)
38
Q

pathway of superior petrosal sinus

A

Run from the posterior ends of the veins of the cavernous sinus to the transverse sinus to then curve to form the sigmoid sinus

39
Q

location of sup petrosal sinus

A

anterolateral portion of the tentorium cerebelli,Attaches to the petrous portion of the temporal bone

40
Q

which veins attached to the petrous portion

A

sup petrosal sinus

41
Q

pathway of inf petrosal sinus

A

Also begins at the posterior ends of the veins of the cavernous sinus inferiorly
• Runs between the petrous portion of the temporal bones and the basilar portion of the occipital bone

42
Q

drainage of inf petrosal sinus

A

Drains the lateral cavernous sinus directly into the origin of the IJV

43
Q

what does the basilar plexus connect

A

Connects inferior petrosal sinus to internal vertebral venous
network

44
Q

what does the emissary veins connect

A

Connect dural venous sinuses with veins outside the cranium

45
Q

what is the arachnoid granulation

A

Collection of arachnoid villi

• Prolongation of arachnoid that protrude through the meningeal layer of the dura into the dural venous sinuses

46
Q

location of arachnoid granulation

A

found in areas of the sup sagittal and transverse sinus

47
Q

what does the arachnoid granulation affect and function

A
  • affect the transfer of CSF to the venous system

- Are structurally adapted to transport CSF from the subarachnoid space to the venous system

EXCI 254 (10 decks)

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