What Is The Lymphatic System?

The lymphatic system is composed of lymph vessels, lymph nodes, and lymphatic ducts. Lymphatic fluid containing proteins, nutrients, and white blood cells (also called lymphocytes) circulate within lymphatic vessels. The lymphatic system helps maintain the body’s balance of fluids, absorbs fats from the intestines to the bloodstream, and helps fight infections.

Lymph nodes are a key part of the body’s immune system, and they enlarge during certain infections or cancers. Jugular lymphatic trunks in the neck drain lymphatic fluids from both sides of the head and neck.

The thoracic duct, the body’s main lymphatic vessel, receives lymphatic fluid from the left jugular trunk and drains into the venous system. Lymphatic fluid is straw-colored; however it can appear “milky” after fat intake in lymphatics of the intestinal tract.