Which of the following is not a remnant of fetal circulation?

The coronary ligament is not a remnant of fetal circulation. It serves as a peritoneal reflection that connects the liver to the diaphragm and lateral abdominal wall, providing structural support to the liver within the abdominal cavity. It does not have a role in fetal blood circulation or any other embryonic function.

In contrast, the ligamentum teres is a remnant of the obliterated umbilical vein, which carried oxygenated blood from the placenta to the fetus. The ligamentum venosum is a remnant of the ductus venosus, which directed blood from the umbilical vein through the liver and into the inferior vena cava, bypassing the hepatic circulation in the fetus. The falciform ligament, while primarily a connective tissue structure that supports the liver, also contains the remnant of the umbilical vein along its free edge, thus linking it to fetal circulation.

Therefore, the other options directly relate to structures involved in fetal blood flow, while the coronary ligament is unrelated to that context.