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36 Cards in this Set
- Front
- Back
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ICA in general supplies:
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-Most of cerebral hemispheres
-Eye |
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Which large pre-cortical arteries stem from ICA?
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-ACA
-MCA |
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What are the 4 segments of ICA prior to branching into ACA/MCA?
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1. Cervical segment
2. Petrous segment 3. Cavernous segment 4. Supraclinoid segment |
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The cervical segment arises from?
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The bifurcation of the common carotid into internal/external carotids.
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What is the Petrous segment?
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ICA as it courses thru the temporal bone.
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How does the Petrous segment get into the brain?
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By passing thru Foramen lacerum
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What is the Cavernous segment?
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ICA in the cavernous sinus
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What is the Supraclinoid segment?
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ICA after piercing the DURA - gives 3 main branches
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3 main branches of the Supraclinoid segment:
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1. Opthalmic artery
2. Posterior communicating artery 3. Anterior choroidal artery |
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2 Important things to note about the Ophthalmic Artery:
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-Feeds eye and optic nerve
-Anastomoses w/ External carotid artery |
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Important thing to remember about PCOM:
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It is an important anastomosis between ICA and posterior circulation (vertebrals)
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Anterior Choroidal Artery supplies:
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-Optic tract
-Part of lat geniculate nucleus -Posterior limb of int. capsule -Anterior hippocampus |
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Lateral geniculate nucleus
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visual pathway
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Posterior limb of internal capsule
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motor pathway
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Anterior hippocampus
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long term memory
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Blockage of the anterior choroidal artery would result in:
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-Visual symptoms
-Paralysis on opposite side of body -Long term Memory loss |
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What could happen if ICA was blocked?
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Could still get blood from Vertebrals and ECA via Opthalmic and PCOM.
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Major structures supplied by MCA:
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-Basal ganglia
-Lateral hemisphere |
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3 divisions of MCA:
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1. M1 Stem
2. Upper division (anterior) 3. Lower division (posterior) |
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Course of M1 MCA stem:
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Moves laterally ventral to the basal ganglia, exits via the Anterior area of the Lateral Sylvian fissure
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Branches of MCA stem:
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Lenticulostriate arteries
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What type of arteries are the Lenticulostriate?
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Precortical perforating arterioles - b/c MCA hadn't gotten to the cortex yet.
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2 Structures supplied by the Lenticulostriate arteries:
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-Basal ganglia
-Anterior internal capsule |
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What are the Basal Ganglia?
(3 components) |
-Putamen
-Caudate nucleus -Globus pallidus |
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Upper division of MCA supplies:
(4 areas) |
-Lateral frontal lobe
-Insula -Primary sensorimotor cortex -Anterior parietal lobe |
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Lower division of MCA supplies:
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-Superior/lateral Temporal lobe
-Posterior parietal lobe -Lateral occipital lobe |
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What do distal portions of the Upper and Lower divisions of MCA anastamose with?
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Upper - ACA
Lower - PCA |
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What symptoms might arise in an Upper division infarct?
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-Sensorimotor on opposite side
-speach problems (insula/ wernicke's area) |
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General area supplied by ACA:
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Medial hemisphere
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3 Branches of ACA:
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-ACA stem (A1)
-Pericallosal -Callosomarginal |
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2 Branches of ACA stem:
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-Lenticulostriates
-ACOM |
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What do the Lenticulostriates from ACA feed?
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-Head of caudate
-Anterior limb of internal capsule |
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So what feeds the Posterior Internal Capsule?
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Anterior choroidal artery (off supraclinoid segment of ICA)
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What feeds the Anterior limb of internal capsule?
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-MCA lenticulostriates
-ACA lenticulostriates |
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3 structures supplied by Pericallosal artery:
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-Cingulate gyrus
-Corpus callosum -Medial sensorimotor cortex |
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What does the Callosomarginal artery supply?
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medial aspect of frontal lobe
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