1. Draw a simple line diagram of the circle of Willis at the base of the brain by doing the following: a. Draw a line to show the division between the two hemispheres and label the top “frontal” and...

1. Draw a simple line diagram of the circle of Willis at the base of the brain by doing the following:

a. Draw a line to show the division between the two hemispheres and label the top “frontal” and the bottom “occipital.”

b. In the lower half of the drawing, show the basilar artery dividing into two posterior cerebral arteries, and extend each down and to the side to the occipital lobes.

c. Midway on the line and on either side of it, draw a circle showing each carotid artery.

d. Draw two branches from each carotid: one extending upward toward the frontal lobe and one outward and away from your central line.

 e. Label the arteries you have drawn. f. Add the communicating arteries to complete the circle, and label them.