One of the most common places to find swollen lymph nodes is in the neck. The inset shows three swollen lymph nodes below the lower jaw. The lymph system is a network of organs, vessels and lymph nodes throughout the body. Many lymph nodes are in the head and neck. Lymph nodes there often swell. 7 Levels of Lymph Nodes in Neck: Complete Guide to Cervical Node Anatomy Understanding the anatomy of the neck, particularly the lymph nodes, is crucial for medical professionals and anyone interested in health. Neck lymph node levels play a significant role in diagnosing and treating various conditions, especially infections and cancers. Learn about the lymph nodes in the neck, their functions, and common issues. Understand how to recognize and address swollen lymph nodes. Swollen lymph nodes often indicate an infection or inflammation, though they can sometimes be a sign of something more serious. Lymph nodes are small, bean-shaped glands that play a crucial role in our immune system by filtering harmful substances and fighting infections.