circulation /cir·cu·la·tion/ (ser″ku-la´shun) movement in a regular course, as the movement of blood through the heart and blood vessels.
lesser circulation.
collateral circulation that carried on through secondary channels after obstruction of the principal channel supplying the part.
enterohepatic circulation the cycle in which bile salts and other substances excreted by the liver are absorbed by the intestinal mucosa and returned to the liver via the portal circulation.
extracorporeal circulation circulation of blood outside the body, as through an artificial kidney or a heart-lung apparatus.
fetal circulation that propelled by the fetal heart through the fetus, umbilical cord, and placental villi. 
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Schematic diagram of fetal circulation, with red indicating the highest level of oxygen saturation, blue the lowest, and purple an intermediate level.
first circulation primordial c.
hypophysioportal circulation that passing from the capillaries of the median eminence of the hypothalamus into the portal vessels to the sinusoids of the adenohypophysis.
intervillous circulation the flow of maternal blood through the intervillous space of the placenta.
lesser circulation pulmonary c.
omphalomesenteric circulation vitelline c.
persistent fetal circulation pulmonary hypertension in the postnatal period secondary to right-to-left shunting of the blood through the foramen ovale and ductus arteriosus.
placental circulation
1. the circulation of blood through the placenta during prenatal life.
portal circulation a general term denoting the circulation of blood through larger vessels from the capillaries of one organ to those of another; applied to the passage of blood from the gastrointestinal tract and spleen through the portal vein to the liver.
primordial circulation the earliest circulation by which nutrient material and oxygen are conveyed to the embryo.
pulmonary circulation the flow of blood from the right ventricle through the pulmonary artery to the lungs, where carbon dioxide is exchanged for oxygen, and back through the pulmonary vein to the left atrium.
systemic circulation the general circulation, carrying oxygenated blood from the left ventricle to the body tissues, and returning venous blood to the right atrium.
umbilical circulation fetal circulation through the umbilical vessels.
vitelline circulation the circulation through the blood vessels of the yolk sac.
lesser circulation.
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