The lymphatic system, crucial for immune function and fluid balance, relies on a complex network of vessels and nodes. The thoracic duct serves as the primary prevertebral collector, draining lymph from three body quadrants into the left subclavian vein. Its anatomy varies, sometimes dilating at its origin, termed cisterna chyli, and its course is essential, ascending between the azygos vein and aorta before reaching the left venous angle. In the upper limbs, lymphatic drainage predominantly occurs along the anterior surface, guided by the superficial venous system. Axillary nodes, including lateral mammary, upper thoracic, subscapular, and axillary vein chains, play a central role. Derivative lymphatic pathways aid in treating conditions like lymphoedema. Lower limb lymphatic drainage involves superficial and deep systems, with vessels draining into the external iliac chain. Inguinal nodes, categorized based on their relationship with the great saphenous vein, are crucial for lower limb drainage. Preserving these nodes prevents secondary lymphatic system injuries, underscoring the importance of precise anatomical knowledge in surgical interventions. Understanding the lymphatic system’s anatomy and function is crucial for medical professionals, facilitating diagnosis, treatment, and surgical interventions for various conditions, from lymphedema to cancer metastasis.