JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Lymph nodes. Artwork showing the position of lymph nodes (green) in the neck. Lymph nodes are part of the lymphatic system, which helps protect against diseases and infections. The nodes contain white blood cells, which destroy bacteria and other invading organisms. Fluid from the body's tissues drains through the lymph vessels and nodes, and is cleaned in the process, before being returned to the bloodstream. Also visible is a carotid artery (red), which carries oxygenated blood from the heart to the brain. The jugular vein (blue), carries deoxygenated blood back to the heart. Salivary glands (pink, upper centre) are also seen.
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