The falciform ligament is a ligament that attaches the liver to the front body wall, and separates the liver into the left medial lobe and right lateral lobe. The falciform ligament, from Latin 'sickle-shaped', is a broad and thin fold of peritoneum, its base being directed downward and backward and its apex upward and forward. The falciform ligament droops down from the hilum of the liver.