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18 Cards in this Set
- Front
- Back
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Circle of Willis: Anterior Circulation
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derived from:
-Internal Carotid supplies: -ACA (anterior cerebral artery) -lateral striate -MCA (middle cerebral artery) |
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Circle of Willis: Posterior Circulation
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derived from:
-Subclavian supplies: -PCA (posterior cerebral artery) -AICA (anterior inferior cerebellar artery) -PICA (posterior inferior cerebellar artery) -Vertebral artery -ASA (anterior spinal artery) |
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MCA (middle cerebral artery)
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Anterior Circulation
Motor Cortex - upper limb & face contralateral paralysis-upper limb & face Sensory cortex - upper limb & face contralateral loss of sensation - upper limb & face Wernicke's area, Broca's area hemineglect if lesion affects NONDOMINANT (usually rt) side |
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ACA (anterior cerebral artery)
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Anterior Circulation
Motor cortex - lower limb Contralateral paralysis of lower limb Sensory Cortex - lower limb Contralateral loss of sensation in lower limb |
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Lateral striate artery
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Anterior Circulation
Striatum, internal capsule contralateral hemiparesis/hemiplegia common location of lacunar infarcts, 2ndary to unmanaged HTN |
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lacunar infarcts
-common location? -caused by? |
commonly of lateral striate artery
-striatum/internal capsule --> contralateral hemiparesis, hemiplegia 2ndary to unmanaged HTN |
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ASA (anterior spinal artery)
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Posterior circulation
Lateral corticospinal tract contralateal hemiparesis - lower limbs Caudal medulla-hypoglossal nerve Ipsilateral hypoglossal dysfxn (tongue deviates ipsilaterally) [Medial lemniscus] - errata said to delete... [decreased contralateral proprioception] |
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PICA (posterior inferior cerebellar artery)
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Posterior Circulation
Lateral medullary syndrome = Wallenberg's Lateral medulla vestibular nuclei lateral spinothalmic tract - limbs/face decreased pain/temp Spinal Trigeminal nucleus - above but for face Nucleus ambiguus - dysphagia, hoarseness, decreased gag reflex Sympathetic fibers - ipsilateral Horner's syndrome Inferior cerebellar peduncle - ataxia, dysmetria |
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hoarse throat, dysphagia?
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Nucleus ambiguus effects
specific to PICA |
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AICA (anterior inferior cerebellar artery)
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Posterior Circulation
Lateral pons - vestibular nuclei, facial nucleus, spinal trigeminal nucleus, cochlear nuclei, sympathetic fibers Middle & inferior cerebellar peduncles Causes: vomiting, vertigo, nystagmus paralysis of ace decreased lacrimation, salivation decreased taste from anterior 2/3 tongue decreased corenal reflex decreased facial pain & temp sensation ipsilateral decreased hearing Ipsilateral Horner's syndrome |
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vomiting, vertigo, nystagmus
paralysis of face decreased lacrimation, salivation decreased taste from anterior 2/3 tongue decreased corenal reflex decreased facial pain & temp sensation ipsilateral decreased hearing Ipsilateral Horner's syndrome |
Lateral pontine syndrome
-key is facial droop & taste sx Facial droop mean's AICA's pooped Facial nucleus effects are specific to AICA lesions |
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PCA (posterior cerebral artery)
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Posterior circulation
Occipital cortex, visual cortex Contralateral hemianopsia w/macular sparing |
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Contralateral hemianopsia w/vascular sparing
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PCA lesion
occipital cortex, visual cortex |
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Vomiting, vertigo, nystagmus
limbs/face - decreased pain & temp sensation Dysphagia, hoarseness, decreased gag reflex Ipsilateral Horner's syndrome Ataxia, dysmetria |
Lateral medullary syndrome
(Wallenberg's) PICA - key is dysphagia/hoarse sx |
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Anterior Communicating Artery
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Communicating, Anterior Circulation
Visual field defects Lesions are typically aneurysms, not strokes |
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Posterior Communicating Artery
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Communicating, Posterior circulation
common site of saccular (BERRY) aneurysm CN III palsy - eye is "down & out" |
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where is the MC site of berry aneurysm?
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bifurcation of anterior communicating artery (& other bifurcations)
-hemorrhagic stroke / subarrachnoid hemorrhage associated w/: ADPKD Ehlers-Danlos Marfans Risk Factors: age HTN smoking race (black) |
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Charcot-Bouchard
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microaneurysms
affects small vessels: in basal ganglia, thalamus associated w/chronic HTN |
