Lymphatic SystemLymphatic System

• Overarching

functions:

defends against

infection and

disease, and

returns tissue fluid

to the bloodstream

PG-Lady!

Components of the Lymphatic System

Lymphatics

Lymphatic Capillaries

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Terminal End of Lymphatic Vessel

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Lymphatic Ducts and the Venous System

Lymphatic Ducts and the Venous System: Another view

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Lymph Node

Lymph Node

Other Lymphatic System Structures

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Tonsils

Peyer’s patches in the distal ileum. PPs seen in a 20-years-old man during ileocolonoscopy. Note that PPs form a lymphoid ring in the distal ileum.

Appendix

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Thoracic Cavity with Thymus

Thymus

Thymus: Cross-section

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Location of Spleen in Abdominal Cavity

Spleen

Spleen: Cross-section

Lymphocytes

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Origins of Lymphocytes

T cell Maturation

Lymphoid cells migrate to the thymus

Mature lymphocytes are transported to peripheral tissues by circulation in the blood

Origins of Lymphocytes: Lymphopoiesis