Final answer:
Lymph from the lower extremities first enters the cisterna chyli, then moves to the thoracic duct, and eventually drains into the left subclavian vein.
Step-by-step explanation:
Lymph collecting from the lower extremities would be delivered to the cisterna chyli first, before moving on up. The cisterna chyli is a sac-like chamber that is located just beneath the diaphragm. It receives lymph from the lower abdomen, pelvis, and lower limbs by way of the left and right lumbar trunks and the intestinal trunk. After the lymph is collected in the cisterna chyli, it then flows into the thoracic duct, which is a large duct that drains lymph from the lower limbs, left thorax, left upper limb, and the left side of the head into the left subclavian vein.
Lymphatic vessels begin as blind ending capillaries and progressively merge into larger vessels and lymphatic trunks, which eventually contribute to the asymmetrical drainage system of the body. The right lymphatic duct, for instance, drains lymph only from the upper right side of the body. In contrast, the thoracic duct handles lymph fluid drainage from the rest of the body, emphasizing the uniqueness of the lymphatic system's structure and function.