Slide show: Female breast anatomy
Illustration of lymph nodes and lymph ducts in the breast
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The lymphatic system is a network of lymph nodes and lymph ducts that helps fight infection. Lymph nodes — found under the armpit, above the collarbone, behind the breastbone and in other parts of the body — trap harmful substances that may be in the lymphatic system and safely drain them from the body.

See more Multimedia Nov. 12, 2014