Which of the Following is Least True of the Circle

Question

Which of the following is least true of the circle of Willis?
A) It is the arterial blood supply to the brain.
B) It is supplied by the internal carotid arteries.
C) It is supplied by the vertebral arteries.
D) Oxygenated blood is delivered to the circle of Willis by the jugulars.

Accepted Answer

Oxygenated blood is not delivered to the circle of Willis by the jugulars, as the jugular veins carry deoxygenated blood away from the brain. The correct answer would be either A, B, or C as all three statements are true.