Special Circulation Hepatic Portal Circulation Cerebral Circulation Pages

Special Circulation Hepatic Portal Circulation Cerebral Circulation Pages 376 -382

Arterial Supply of: the Brain and the Circle of Willis CEREBRUM: ◦ Blood supply branches from internal carotid arteries Cerebral arteries BRAIN STEM AND CEREBELLUM: ◦ Blood supply branches from Vertebral arteries Basilar artery This system of arteries branches to form a circle which supplies the major brain structures © 2015 Pearson Education, Inc.

Figure 11. 15 a Arterial supply of the brain. Anterior Frontal lobe Cerebral arterial circle (circle of Willis) Internal carotid artery Temporal lobe Pons Basilar artery Vertebral artery Occipital lobe (a) Cerebellum Posterior

Figure 11. 15 b Arterial supply of the brain. (b)

Hepatic Portal Circulationdual blood supply sends blood from certain organs (digestive, pancreas, spleen) for processing by the liver The hepatic portal vein is the transport vessel After nutrients are removed and stored, blood is returned to systemic circulation ◦ via the hepatic portal vein to the inferior vena cava veins are supplying the liver with blood for processing while arteries supply the liver with oxygen © 2015 Pearson Education, Inc.

Figure 11. 16 The basic scheme of the hepatic portal system. Arterial blood Inferior vena cava Stomach and intestine Nutrients and toxins absorbed Venous blood Liver cells (hepatocytes) Nutrients and toxins leave Hepatic portal vein First capillary bed Second capillary bed Hepatic (liver sinusoids) vein Hepatic portal system

Figure 11. 17 The hepatic portal circulation. Inferior vena cava (not part of hepatic portal system) Liver Hepatic portal vein Gastric veins Spleen Stomach Splenic vein Inferior mesenteric vein Superior mesenteric vein Small intestine Large intestine

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