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Lymphatic system
Lymphatic system


Lymphatic system
Lymphatic system


Lymph system

Definition:

The lymph system is a network of organs, lymph nodes, lymph ducts, and lymph vessels that make and move lymph from tissues to the bloodstream. The lymph system is a major part of the body's immune system.



Information:

Lymph is a clear-to-white fluid made of:

  • White blood cells, especially lymphocytes, the cells that attack bacteria in the blood
  • Fluid from the intestines called chyle, which contains proteins and fats

Lymph nodes are soft, small, round- or bean-shaped structures. They usually cannot be seen or easily felt. They are located in clusters in various parts of the body, such as the:

  • Neck
  • Armpit
  • Groin
  • Inside the center of the chest and abdomen

Lymph nodes make immune cells that help the body fight infection. They also filter the lymph fluid and remove foreign material such as bacteria and cancer cells. When bacteria are recognized in the lymph fluid, the lymph nodes make more infection-fighting white blood cells, which cause the nodes to swell. The swollen nodes are sometimes felt in the neck, under the arms, and groin.

The lymph system includes the:

  • Tonsils
  • Adenoids
  • Spleen
  • Thymus


References:

Hall JE. The microcirculation and lymphatic system. In: Hall JE, ed. Guyton and Hall Textbook of Medical Physiology. 12th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 16.




Review Date: 10/27/2014
Reviewed By: Laura J. Martin, MD, MPH, ABIM Board Certified in Internal Medicine and Hospice and Palliative Medicine, Atlanta, GA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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Atlantic Medical Group
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Morristown Medical Center

100 Madison Avenue
Morristown, NJ 07960
973-971-5000

Overlook Medical Center

99 Beauvoir Avenue
Summit, NJ 07901
908-522-2000

Newton Medical Center

175 High Street
Newton, NJ 07860
973-383-2121

Chilton Medical Center

97 West Parkway
Pompton Plains, NJ 07444
973-831-5000

Goryeb Children's Hospital

100 Madison Avenue
Morristown, NJ 07960
973-971-5000

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Atlantic Medical Group

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