LYMPHATIC SYSTEM

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LYMPHATIC SYSTEM

• Chapter 9 -3

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LYMPHATIC SYSTEM

• LYMPH
• Excess tissue fluid and fluid from lymph vessels
  that doesnt 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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Organs of lymphatic system Lymph nodes/
glands Spleen Tonsils Thymus
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LYMPH VESSELS

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

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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

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Palpable/Superficial LN 5
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LN Infection

• Painful and swollen acute reaction
• Swollen and nonpainful chronic reaction

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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

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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

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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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