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LYMPHATIC SYSTEM

LYMPHATIC SYSTEM. Chapter 9 -3. LYMPHATIC SYSTEM. LYMPH Excess tissue fluid and fluid from lymph vessels that doesn’t re-enter capillaries of the body Rich in white blood cells, protein, and water (~plasma) and is circulated through the body by the lymphatic vessels.

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LYMPHATIC SYSTEM

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  1. LYMPHATIC SYSTEM Chapter 9 -3

  2. LYMPHATIC SYSTEM • LYMPH • Excess tissue fluid and fluid from lymph vessels that doesn’t re-enter capillaries of the body • Rich in white blood cells, protein, and water (~plasma) and is circulated through the body by the lymphatic vessels

  3. Organs of lymphatic system: Lymph nodes/ glands Spleen Tonsils Thymus

  4. LYMPH VESSELS • Structure resembles veins as they have valves to prevent backflow • Lymphatic capillaries > lymphatic vessels • Collect lymph and carry it toward the heart via the THORACIC DUCT which will eventually empty into the subclavian veins

  5. LYMPH NODES/GLANDS • Enclosed in fibrous capsules • Named for their location (cervical) in the body (vary in size) • Act as filters: bacteria, foreign particles, malignant cells • Soldiers

  6. Palpable/Superficial LN: 5

  7. LN Infection Painful and swollen = acute reaction Swollen and nonpainful = chronic reaction

  8. SPLEEN • Largest structure of lymphoid system • Large, flattened, oval-shaped organ that is dark red/black in color • Located caudal to the stomach • Enlarges with infectious disease FUNCTIONS: • HEMATOPOIESIS – forms lymphocytes, monocytes, plasma cells • PHAGOCYTOSIS – removes and destroys microorganisms, bad platelets, old RBCs (recycles globin and heme) • Stores blood

  9. TONSILS 3 pair • Masses of lymphoid tissue • Palatine, lingual, pharyngeal • Differ from lymph nodes as they are near moist surfaces and are located at the beginning of lymph drainage

  10. THYMUS • Structure of lymph tissue located cranial to the heart • Part of the immune system – produces lymphocytes • Largest in young animals, atrophies over time

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