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circle of Willis

   Also found in: Dictionary/thesaurus, Financial, Encyclopedia, Wikipedia, Hutchinson 0.42 sec.
circle of Wil·lis (wls)
n.
A roughly circular anastomosis that is located at the base of the brain and formed by the anterior communicating artery, the two anterior cerebral, the two internal carotid, the two posterior communicating, and the two posterior cerebral arteries.
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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.
Styloid-carotid artery syndrome by Osborne, Ryan F. / Ear, Nose and Throat Journal
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.
Physical Examination of the Spine by Bechtel, Roy / Physical Therapy
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.
Initial Patients Enrolled in EMPiRE Study of GORE Neuro Protection ... by Business Wire
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