Where do retroperitoneal lymphatics join the lymphatic system?

The retroperitoneal lymphatics join the lymphatic system at the cisterna chyli, which is located at the level of T12 to L2 vertebrae. The cisterna chyli serves as a major collection point for lymphatic fluid from the lower body, particularly from the abdomen and pelvis. Lymphatic fluid from the retroperitoneal space, which includes lymph from the kidney and adjacent structures, drains into this reservoir before it continues to the thoracic duct.

This anatomical feature is critical as it highlights the pathway of lymph drainage and the integration of various lymphatic regions into the central circulatory system. The thoracic duct then carries the lymph from the cisterna chyli upwards through the thorax, eventually draining into the venous system at the junction of the left subclavian and internal jugular veins. Understanding this connection is essential for phlebology, especially in evaluating lymphatic drainage issues and related pathologies.