Circle of Willis: ACA, MCA, and PCA Stroke Symptoms

One circle feeds the whole brain, and a stroke anywhere in it writes a different deficit.

The Circle of Willis: two carotids in front, two vertebrals behind, joined by communicating arteries.

One ring, so one blockage can still find another way in.

Front: anterior cerebral. It feeds the inner leg.

Block it, and the leg goes weak, sometimes with a personality change.

Side: middle cerebral, the most common stroke.

Face and arm go weak, and if it is the dominant side, speech goes too.

Back: posterior cerebral. It feeds vision.

Block it, and half the visual world disappears on the opposite side.

So, sudden right face and arm weakness, and he cannot speak.

Which artery and which side? Drop it below.

Save the circle. ACA: leg. MCA: face, arm, and speech.

PCA: vision.