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Part of the immune system
Function
◦ Protects body from
 Infection
 Disease
◦ Aids in absorption of fat from intestines
◦ Removes excess fluid from body tissue
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Lymph
Lymph nodes
Lymphatic vessels
Tonsils
◦ 3 pairs
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Thymus
Spleen
Bone marrow
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Lymph
◦ Aka tissue fluid
 Clear fluid
◦ Travels through
 Lymphatic vessels
 Capillaries
 Fills spaces between
cells and tissue
 Carries blood cells
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Lymph nodes
◦ Round / oval masses
of lymphatic tissue
◦ Located
 Throughout body
◦ Produce
 Antibodies
 Lymphocytes
 Specialized WBC
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Tonsils
◦ Palatine
 Largest
 Easily visible in back of
mouth
◦ Lingual
 Located on back of
tongue
◦ Nasopharyngeal
 Aka Adnoids
 Located on the base of
the skull
 Nasopharynx
◦ Function
 Prevent and fight
infections
 Tonsillitis
 Infection of the tonsil
tissue
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Thymus
◦ Located under the
sternum.
◦ Function
 Produces hormones
 Help produce a special
WBC
 T – cell
 thymocytes
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Spleen
◦ Located behind the
stomach
◦ Function
 Produces WBC’s
 Lymphocytes and
 Monocytes
 Stores
 Platelets
 Filters
 Old RBC’s
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Bone marrow
 2 types
◦ Red
 Produces
 RBC’s, WBC’s, platlets
◦ Yellow bone marrow
 Produces
 WBC’s
 Leukyocytes
 Fight infection
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Lymphoma, HIV, AIDS are all diseases of the
Immune system.
Someone w/ a weak immune/lymphatic
system is more susceptible to disease and
has less ability to fight a disease.
Periodontitis, and caries are diseases of the
oral cavity.
Any questions…..????