Lymphatic System

Lymphatic System

Plasma vs. Interstitial Fluid vs. Lymph

Functions: Transports Excess Interstitial Fluid Back to Bloodstream

• Lymphatic vessels collect lymph from loose connective tissue

• Carry fluid to great veins in the neck

• Fluid flows only toward the heart

Functions: Distributes hormones, nutrients, and waste products

Functions: Houses Lymphocytes

B- and T- Lymphocytes

B- lymphocyte T-lymphocyte

Thymus Gland

B- and T- Lymphocytes

B and T cells

Cytotoxic T cell

T cells attacking a tumor cell

Helper T- Lymphocytes

Helper T Cells

HIV attacking helper T-cell

Antibodies

Cytotoxic T- Lymphocytes

Cytotoxic T cell

Function: Generates an Immune Response

Components of the Lymphatic System

• Lymph

• Lymphatic Vessels

• Lymphocytes

• Lymphoid Nodules (Tonsils)

• Lymphoid Organs

Lymphatic Vessels

• Lymph Capillaries

• Lymphatic Trunks

• Lymphatic Collecting Ducts

• Lymphatic Ducts

Lymph Capillaries

Lymphatic Capillaries

Lymphatic Capillaries and Lymphatic Vessels

Lymphatic Trunks

Lymphatic Ducts

Lymphatic Ducts

Lymphatic Ducts

Lymphoid Nodules (Tonsils)

Figure 20.9

Peyer’s Patches and Tonsils

Swollen Tonsils

Figure 20.9

Swollen Tonsils

Lymphoid Organs

• Lymph Nodes

• Thymus Gland

• Spleen

Figure 20.9

Lymph Nodes

Figure 20.3

Lymph Nodes

Lymph Nodes

Lymph Nodes

Lymph Node Histology

Lymph Nodes in Breast

Thymus Gland

Thymus Gland

Thymus Gland

Spleen

Spleen

Spleen

Spleen

Spleen

Spleen

Spleen Histology

Disorders of the Lymphatic and Immune Systems

• Mononucleosis – viral disease caused by Epstein-Barr virus• Attacks B lymphocytes

Disorders of the Lymphatic and Immune Systems

• Hodgkin’s disease – malignancy of lymph nodes

• Non-Hodgkin’s lymphoma • Uncontrolled multiplication and metastasis of

undifferentiated lymphocytes