Lymph nodes are small, bean-shaped structures that are part of the lymphatic system and immune system. They are located throughout the body, often in clusters, and play a key role in filtering lymph fluid and fighting infections. Common locations of lymph nodes include:
- Neck (cervical lymph nodes)
- Armpits (axillary lymph nodes)
- Groin (inguinal lymph nodes)
- Chest
- Abdomen (belly)
- Behind the ears
- Back of the knees
These lymph nodes filter lymph fluid coming from nearby organs and tissues, trapping bacteria, viruses, and other harmful substances
. Most lymph nodes lie near the trunk of the body and are connected by lymphatic vessels. Some lymph nodes, such as those in the neck, armpits, and groin, are near the surface of the skin and can sometimes be felt when swollen
. Notably, lymph nodes are absent in the brain and spinal cord but lymphatic drainage from the central nervous system goes to deep cervical lymph nodes in the neck
. In summary, lymph nodes are distributed widely throughout the body, with major clusters in the neck, armpits, groin, chest, and abdomen.
