Lymphatic System Vessels Organs and Tissues Lymphatic System

Lymphatic System Vessels, Organs and Tissues

Lymphatic System n Vessels: Connect to CV q Lymphatics n n n q n Transport fluid => lymph Organs: house immune cells q q q n Capillaries Collecting vessels Trunks LN Spleen Thymus Tissues q q q Tonsils GALT MALT

Fluid Compartments n Capillary Dynamics q q n Hydrostatic/Hydraulic Osmotic Fluid Compartments q q ICF ECF n n n ISCF Plasma Lymph

Lymphatic Capillary

Lymph Flow

Lymphatic Valve

Lymphatic Vessels and Ducts

Thoracic Duct

Lymph Return

Problem Lymph Return : Lymphedema

Lymphatic Vessel Circuits

Lymph Node: Location

L. N. : Specimen

Lymph Node: Gross Anatomy n n n n 1. Afferent Lymphatics 2. Cortex 3. Germinal Center 4. Capsule 5. Medullary cord 6. Valve 7. Efferent Lymphatics

LN Structure: CT and vessels n n n Capsule Subcapsular sinus Trabecula Reticular CT stroma Vessels q Types n n q Afferent Efferent Valves

Lymph Node

Lymph Node: Histology B cells T cells MO

Lymph Node: Capsule Region

Lymph Node: Cortex Lymphatic Nodule Germinal Center

Lymph Node: Medulla

Lymph Node: Medullary Cords Macrophages Medullary Cords Sinusoids

L. N. Medullary Cells n n P = Plasma cells (daughter cells of Activated B cells M = Macrophages (mature monocytes in tissues)

LN Histology Summary

Diagnostics for Lymphatics and LN Lymphangiogram

Lymphatic Problem: Lymphoma

Lymphatic Nodule: Basic structure for All Lymphatic tissue

Spleen: Location

Spleen: Gross Anatomy

Spleen: Histology Splenic Sinusoid

Spleen Problems n n n Rupture Hydatid cyst Cancer Infection

Thymus: Location

Thymus: Gross

Thymus Embryological Development n n n n n 1. Mandibular arch 2. Hyoid arch 3. Cervical sinus entry 4. 3 rd pharyngeal pouch 5. 4 th pharyngeal pouch 6. Foramen cecum 7. Thyroid 8. Cervical sinus 9. Thymus (3 rd pouch) 10. Thymus (4 th pouch)

Thymic Cell Development n n n 1. Thymic capsule 2. Thymic nurse cells 3. CT septa and BV 4. Subcapsular epithelium (for the blood thymus barrier) 5. Cortical Epithelial cells 6. Medullary epithelial cells 7. Dendritic cells 8. Hassall’s Corpuscle 9. Macrophages 10. Cortex 11. Medulla

Thymic Organization

Thymic Capsule, Septa and Lobules

Thymus: Cortex

Thymic Medulla

Thymic Age Degeneration

Thymic Problem Thymic Aplasia

Tonsil: Location n n Pharyngeal [Adenoids] Palantine Lingual Tubal

Palatine Tonsil

Tonsil: Epithelial Histology

Tonsil Lymphatic Nodules

Tonsilar Crypt

Tonsil Problem: Tonsillitis

Gut Associated Lymphatic Tissue (GALT) Location

GALT

Peyer’s Patches

Ileum Problems Inflammation Necrosis

Appendix: Gross

Appendix

Appendix Problems Appendicitis Appendix rupture and necrosis

MALT bronchus epiglottis

Summary Overview

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