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See: bailiwick, contour, cycle, enclosure, encompass, hedge, outline, perambulate, region, scope, society, sphere How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Magnetic resonance arteriography and magnetic resonance venography showed that the circle of Willis was patent, as were the internal and external jugular veins bilaterally. For example, the vertebral artery test is recommended to evaluate the patency of blood flow in the vertebral arteries, which supply the majority of blood to the anterior cervical spinal cord and go on to supply the brain stem and the circle of Willis at the base of the brain. By establishing the shunt between the carotid artery and femoral vein, blood from the opposite side of the brain via the Circle of Willis and collateral vessels is redirected to the lower pressure venous return. |
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