BIOL 6265 Lecture Notes - Lecture 5: Middle Cerebral Artery, Posterior Cerebral Artery, Anterior Cerebral Artery

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17 May 2018
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What are the 2 main arteries in the brain?
Internal carotid and veretebral
Internal carotid artery
Supply blood to the anterior portion of the brain
How many internal carotid arteries are there?
2; Anterior and middle cerebral
Vertebral artery
(And basilar) supply blood to the posterior brain
What is the basilar artery?
The joining of the two vertebral arteries (go through cervical vertebrae)
What arteries off-shoot the basilar artery?
Superior cerebellar, anterior-inferior cerebellar, and posterior cerebral
Circle of Willis
Ring of arteries (Basilar & internal carotid) and anastomoses (connective arteries) located @ the base of
the brainstem
Why are the anastomoses important?
They are a safety mechanism
What 3 major cerebral arteries arise from the Circle of Willis?
Anterior cerebral artery (ACA)
Middle cerebral artery (MCA)
Posterior cerebral artery (PCA)
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Where do the anterior, middle, and posterior cerebral artery provide blood to?
Cerebrum
What are the inputs for the Circle of Willis?
Vertebral-Basilar artery
Internal carotid artery
What are the outputs for the Circle of Willis?
ACA, MCA, PCA
Where does the Anterior Cerebral Artery provide blood to?
Medial surface of frontal and parietal lobes, corpus callosum, basal ganglia, and internal capsule
Where does the Middle Cerebral Artery provide blood to?
Lateral surface: temporal lobe, primary sensory areas, basal ganglia, and internal capsule
Where does the Posterior Cerebral Artery provide blood to?
Inferior temporal & occipital lobe, medial occipital lobe, Primary Visual area, upper midbrain,
diencephalon, and cerebellum
Venous return
Surface and deep veins of brain dumping deoxygenated blood into venous sinuses
What are the two important venous sinuses?
Superior sagittal sinus and transverse sinus
Internal jugular
Sinuses pool venous blood into here and lead it back to the heart
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Document Summary

Supply blood to the anterior portion of the brain. Vertebral artery (and basilar) supply blood to the posterior brain. The joining of the two vertebral arteries (go through cervical vertebrae) Ring of arteries (basilar & internal carotid) and anastomoses (connective arteries) located @ the base of the brainstem. Medial surface of frontal and parietal lobes, corpus callosum, basal ganglia, and internal capsule. Lateral surface: temporal lobe, primary sensory areas, basal ganglia, and internal capsule. Inferior temporal & occipital lobe, medial occipital lobe, primary visual area, upper midbrain, diencephalon, and cerebellum. Surface and deep veins of brain dumping deoxygenated blood into venous sinuses. Sinuses pool venous blood into here and lead it back to the heart. Many cranial nerve nuclei (trigeminal, facial, & auditory) How pons sends impulses to relay center from cerebrum. Anterior lobe, posterior lobe, flocculondular lobe, and cerebellar pedundes. Maintains equilibrium: sense of where body is with respect to gravity and sense of up vs. down.

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