Chapter 36: Intracranial Cerebrovascular Evaluation

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1

anterior cerebral artery (ACA)

smaller of the two terminal branches of the internal carotid artery

2

anterior communicating artery (ACoA)

a short vessel that connects the anterior cerebral arteries at the interhemispheric fissure

3

basilar artery (BA)

formed by the union of the two vertebral arteries

4

cerebral vasospasm

vasoconstriction of the arteries

5

circle of Willis

a polygon vascular ring at the base of the brain

6

internal carotid artery (ICA)

larger of the two terminal branches of the common carotid artery that arises from the common carotid artery to supply the anterior brain and meninges

7

mean velocity

based on the time average of the outline velocity (maximum velocity envelope)

8

middle cerebral artery (MCA)

large terminal branch of the internal carotid artery

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ophthalmic artery

first branch of the internal carotid artery

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posterior cerebral artery (PCA)

originates from the terminal basilar artery and courses anteriorly and laterally

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posterior communicating artery (PCoA)

courses posteriorly and medially from the internal carotid artery to join the posterior cerebral artery

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subclavian steal syndrome

characterized by symptoms of brain stem ischemia associated with a stenosis or occlusion of the left subclavian, innominate, or right subclavian artery proximal to the origin of the vertebral artery

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submandibular window

transducer is placed at the angle of the mandible and is angled slightly medially and cephalad toward the carotid canal

14

suboccipital window

transducer is placed on the posterior aspect of the neck inferior to the nuchal crest

15

transorbital window

transducer is placed on the closed eyelid

16

transtemporal window

transducer is placed on the temporal bone cephalad to the zygomatic arch anterior to the ear

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vertebral artery

branch of the subclavian artery