1. Chapter 20: The Lymphatic System

2. Florence Rena Saba – 1871-1953 - discovered important link between blood vessel and lymphatic vessel genesis

3. Human Anatomy and Physiology, 7e by Elaine Marieb & Katja Hoehn Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings. Figure 20.1: Distribution and special structural features of lymphatic capillaries, p. 774. Venous system Arterial system Heart Lymph duct Lymph trunk Lymph node Lymphatic system Lymphatic collecting vessels, with valves Lymphatic capillary Blood capillaries Tissue cell Blood capillaries Tissue fluid VenuleArteriole Lymphatic capillary Loose connective tissue around capillaries Fibroblast in loose connective tissue Flaplike minivalve Endothelial cell Filaments anchored to connective tissue (a) (b)

4. Human Anatomy and Physiology, 7e by Elaine Marieb & Katja Hoehn Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings. Figure 20.2a: The lymphatic system, p. 776. Cervical nodes Entrance of right lymphatic duct into right subclavian vein Internal jugular vein Entrance of thoracic duct into left subclavian vein Thoracic duct Cisterna chyli Lymphatic collecting vessels Axillary nodes Inguinal nodes Regional lymph nodes: Aorta (a)

5. Human Anatomy and Physiology, 7e by Elaine Marieb & Katja Hoehn Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings. Figure 20.4: Lymph node, p. 778. (b)(a) Follicles Trabecula Subcapsular sinus Capsule Medullary cords Medullary sinuses Afferent lymphatic vessels Efferent lymphatic vessels Capsule Trabeculae Hilum Cortex: Lymphoid follicle Germinal center Subcapsular sinus Medulla: Medullary cord Medullary sinus

6. Human Anatomy and Physiology, 7e by Elaine Marieb & Katja Hoehn Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings. Figure 20.5: Lymphoid organs, p. 779. Tonsils (in pharyngeal region) Thymus (in thorax; most active during youth) Spleen (curves around left side of stomach) Peyer’s patches (in intestine) Appendix