Circulation of the CNS Flashcards Preview

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Flashcards in Circulation of the CNS Deck (25):
1

How much of the CO is required by the CNS?

10-20%

2

Describe auto-regulation?

Adequate perfusion of CNS is maintained despite changes in arterial pressure 

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3

Which major arterial systems form the Circle of Willis?

Vertebro-basilar system

Internal carotid system 

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4

How are the anastamoses formed in the Circle of Willis advantageous?

Blood can bypass blockage in any part of the circle

5

Which arteries form the origin of the Circle of Willis?

Internal carotid artery

Vertebral artery

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6

How does the internal carotid artery enter the cranium?

Runs through carotid canal

Enters in middle cranial fossa, lateral to optic chiasm 

7

How does the vertebral artery enter the cranium?

Through transverse foramina and into foramen magnum

8

Describe the major branches of the Circle of Willis?

Posterior cerebral artery

Middle cerebral artery

Anterior cerebral artery

Posterior communicating artery

Anterior communicating artery

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9

Describe the vascular distribution of the ACA?

Medial part of frontal and parietal lobes

Includes motor and sensory cortices for lower limb

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10

Describe the pathway of the ACA?

Originates from internal carotid

Projects medially through longitudinal fissure

Forms hook around front of corpus callosum

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11

Describe the pathway of the MCA?

Originates from internal carotid

Projects straight out through lateral fissure towards lateral aspect of cerebrum

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12

Describe the vascualr distribution of the MCA?

Lateral surface of brain (including parts of all four lobes and insula)

Includes motor and sensory cortices for most of body (except lower limb), parieto-occipital asscoiation areas, and language areas

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13

Describe the pathway of the PCA?

Originates from basilar artery

Projects laterally and posteriorly and heads towards occipital lobes

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14

Describe the vascular distribution of the PCA?

Medial and inferior surfaces of temporal and occipital lobes 

Includes visual cortex

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15

List the small perforating branches of the Circle of Willis?

Lenticulostriate arteries

Pontine branches

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16

What do the small perforating branches of the Circle of Willis supply?

Deep structures where they come off the main arteries

Lenticulostriate arteries: basal ganglia and internal capsule

Pontine branches: ventral pons

17

Describe the origins of the small perforating branches in the Circle of Willis?

Lenticulostriate arteries: branch off MCA

Pontine branches: come directly off basilar artery

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18

What are the other named arteries that arise from the Circle of Willis?

Opthalmic artery

Anterior choroidal artery

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19

What dies the opthalmic artery supply?

Eye

Top of nasal cavity

Frontal scalp

20

What does the anterior choroidal artery supply?

Structures in deep lateral hemispheres: 

Optic tract

Lateral ventricles

Hippocampus

21

List the brainstem arteries that arise from the Circle of Willis?

Superior cerebellar artery

Anterior inferior cerebellar artery

Posterior inferior cerebellar artery 

(Anterior spinal artery)

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22

Decribe the blood supply to the midbrain?

Most from PCA

Colliculi - superior cerebellar artery

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23

Describe the blood supply to the pons?

Pontine branches of basilar artery

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24

Describe the blood supply to the medulla?

3 arteries:

Anterior spinal artery: supplies anterior and middle

Veretebral artery: supplies area around where olives are, ventrolateral

Posterior inferior cerebellar artery: supplies posterolateral

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25

Which arteries supply the spinal cord?

Anterior spinal artery

Posterior spinal arteries 

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