The sixth aortic arch becomes the pulmonary arteries, which are derived from a common pulmonary trunk on the aorta. C. Posterior arteries The dorsal aorta is the large median longitudinal artery that extends posteriorly and eventually branches into the caudal artery. The celiac artery, which leads to the stomach, duodenum, liver and pancreas, and the mesenteric artery, which serves the remainder of the liver and the gut. These branches serve the spinal cord, muscles and skin. Also includes the caudal vein, which runs to the cloacal area.
Cardinal system Drains the head, dorsal body wall and kidneys.
Consists of the lateral abdominal veins, which receive blood from the iliac and subclavian veins. A. Anterior veins The anterior veins are derived from the cardinal system. The hepatic portal system is derived from the subintestinal system. The hepatic portal vein receives blood from the gut region. Inside the liver, the vein breaks up into hepatic sinusoids, where the blood meets hepatic cells and phagocytic cells.