Lymphatic System Part 2 Lymphatic System Organization Lymphoid

Lymphatic System Part 2

Lymphatic System Organization • Lymphoid Nodules • Tonsils are lymphoid nodules in the pharynx wall Copyright © 2007 Pearson Education, Inc. , publishing as Benjamin Cummings

Lymphatic System Organization • The Tonsils Figure 14 -5

Lymphatic System Organization • What are the Lymphoid Organs? • Important lymphoid organs include: • Lymph nodes • Thymus • Spleen Copyright © 2007 Pearson Education, Inc. , publishing as Benjamin Cummings

Lymphatic System Organization • What are Lymph Nodes? • Encapsulated masses of lymphoid tissue containing lymphocytes • Monitor and filter lymph • Remove antigens • Starts immune response Copyright © 2007 Pearson Education, Inc. , publishing as Benjamin Cummings

• The Structure of a Lymphatic System Organization Lymph Node Figure 14 -6

Lymphatic System Organization • What is the Thymus? • Lies behind sternum • Produces thymosins • Hormones that regulate T cell development Copyright © 2007 Pearson Education, Inc. , publishing as Benjamin Cummings

• The Thymus Lymphatic System Organization Figure 14 -7

Lymphatic System Organization • The Thymus Figure 14 -7(a)

Lymphatic System Organization • The Thymus Figure 14 -7(b)

Lymphatic System Organization • What is the Spleen? • White pulp • Removes antigens • Starts immune response • Red pulp • Contains red blood cells • Recycles damaged or out-dated RBCs Copyright © 2007 Pearson Education, Inc. , publishing as Benjamin Cummings

• The Spleen Lymphatic System Organization Figure 14 -8