[의학] 뇌혈관 해부학과 뇌혈과 손상시 임상양상

Role of Blood Supply Nutrition to parenchyma (brain cells). Brain is completely dependent on oxygen supply - No O2 reserves. Irreversible damage in 4-6 minutes if no oxygen Brain requires 20% of O2 for 2% of body weight. Brain requires glucose for energy No ability to use fat Remove carbon dioxide and waste-products from cells Cerebral perfusion ` 60 ml/100gr min-1 in Gray matter 40 ` X ` 60 in White matter 750mL blood pumped per minute and circulated blood returned for reoxygenation Vascular Network Network of arteries and veins Arteries carry blood away from the heart Arteries divide into smaller vessels called: arterioles Arterioles divide further into capillaries Vascular Network Veins carry blood toward the heart Smallest level are venules that are connected to capillaries Venules Carry blood to sinuses on cortical surface Local blood flow Arteries Arterioles Capillaries Venules Sinuses Cerebrovascular Supply Two Systems Carotid System Vertebral Basil…
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