Lymph nodes are small, bean-shaped glands that are part of the immune system and are located throughout the body. They are found in clusters in several key areas, including:

• Neck (cervical lymph nodes)
• Armpits (axillary lymph nodes)
• Groin (inguinal lymph nodes)
• Chest
• Abdomen (belly)
• Behind the ears
• Back of the knees

These nodes filter lymph fluid, which contains waste products and immune cells, helping to fight infections and filter out harmful substances

. Most lymph nodes lie near major blood vessels and are more concentrated around the trunk of the body. They are absent in the brain and spinal cord but receive lymphatic drainage from the central nervous system via deep cervical lymph nodes

. In summary, lymph nodes are distributed widely but are especially concentrated in the neck, armpits, groin, chest, and abdomen.