The path of a drop of venous blood from the left ankle to the right side of the brain is as follows:
Inferior vena cava brings blood from the abdomen and leg area including ankle to heart.
Then from heart blood goes through left atrioventricular valve left ventricle aortic semilunar valve, aorta, brachiocephalic trunk, right common carotid artery, right internal carotid artery, circle of willis capillary bed of frontal lobe, transverse sinus, right side of the brain.
In this way, venous blood goes from left ankle to the right side of the brain.
Venous blood from the ankle travels and goes through tibial vein, popliteal vein, femoral vein, external iliac vein, common iliac vein, inferior vena cava to the heart (right side). From the heart to the right side of the brain, blood goes through the aorta and the brachiocephalic artery. The brachiocephalic artery the then divides into the right common carotid artery and the right subclavian artery and both supply the right side of the brain.
