What are the right and left triangular ligaments?

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These ligaments are peritoneal folds that anchor the liver to the diaphragm. On the diaphragmatic surface, the liver has a bare area where peritoneum is absent. At the far right and left edges of this bare area, the peritoneum reflects from the liver to the diaphragm, creating the right and left triangular ligaments. They are purely peritoneal reflections, not veins or residual peritoneum over the liver. They are distinct from the falciform ligament, which lies on the anterior surface and contains the ligamentum teres. Understanding these attachments helps explain how the liver is fixed to the diaphragm and how the peritoneal reflections form the diaphragmatic ligaments seen in practice.