Transcript Chapter 20
Chapter 20: The Lymphatic System
Florence Rena Saba – 1871-1953 - discovered important link between blood vessel and lymphatic vessel genesis
Figure 20.1: Distribution and special structural features of lymphatic capillaries, p. 774.
Venous system Heart Arterial system Venule Loose connective tissue around capillaries Lymph duct Lymph trunk Lymph node Lymphatic system Lymphatic collecting vessels, with valves Lymphatic capillary Arteriole
Tissue fluid
Blood capillaries Lymphatic capillary Blood capillaries Tissue cell (a) Filaments anchored to connective tissue Endothelial cell Flaplike minivalve Fibroblast in loose connective tissue (b)
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.
Regional lymph nodes: Cervical nodes Axillary nodes Inguinal nodes
Human Anatomy and Physiology,
7e by Elaine Marieb & Katja Hoehn
(a) Entrance of right lymphatic duct into right subclavian vein Internal jugular vein Entrance of thoracic duct into left subclavian vein Thoracic duct Aorta Cisterna chyli Lymphatic collecting vessels
Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings.
Figure 20.4: Lymph node, p. 778.
Afferent lymphatic vessels (a)
Human Anatomy and Physiology,
7e by Elaine Marieb & Katja Hoehn
Capsule Cortex: • Lymphoid follicle • Germinal center • Subcapsular sinus Efferent lymphatic vessels Follicles Trabecula Subcapsular sinus Hilum Medulla: • Medullary Capsule cord • Medullary sinus Medullary cords Trabeculae Medullary sinuses (b)
Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings.
Figure 20.5: Lymphoid organs, p. 779.
Human Anatomy and Physiology,
7e by Elaine Marieb & Katja Hoehn
Tonsils (in pharyngeal region) Thymus (in thorax; most active during youth) Spleen (curves around left side of stomach) Peyer’s patches (in intestine) Appendix
Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings.