Lymphatic System Flashcards
Lymphatic System Overview
Includes:
1) Lymph vessels and Organs
2) T + B Lymphocytes
- Protect body against bacteria, viruses, cancer cells
Major Extracellular Fluids
1) Blood Plasma
- Fluid in blood
2) ISF (Interstitial Fluid)
- Bathes cell (except blood cells)
3) Lymph
- Inside lymphatic Vessels
ISF (Interstitial Fluid)
- Formed in the capillaries leaking plasma
- 90% re-enters blood in capillaries + venules
- 10% into lymphatic circulation (now called lymph)
Lymph
- Enters lymphatic capillaries (closed ended vessels)
- Lymphatic capillaries connect to lymphatic collecting vessels (have valves)
- Lymph nodes along vessels filter lymph (bacteria, debris)
- Transport lymph fluid AWAY from tissues to:
1) Right lymphatic duct (lymph from right head, chest, + arm) - Drains into right subclavian vein re-entering circulation
2) Thoracic duct (lymph from below ribs + left body - Collecting vessels from below the ribs converge to an enlarged lymph vessel = cisterns chilli (beginning of thoracic duct)
- Thoracic duct drains into l. Subclavian vein re-entering blood circulation.
Summary of Lymphatic System
Lymphatic Capillaries – Lymphatic Collecting Vessels (with valves) – Lymphatic Ducts – Subclavian Viens
Primary Lymphatic Organs + Tissues
1) Red bone Marrow
- Lymphocytes arise here - called lymphoid stem cells
- B lymphocytes mature and proliferate (mitosis) here
2) Thymus Gland
- T lymphocytes mature and proliferate (Mitosis) here
Secondary lymphatic Organs + Tissues (Where Lymphocytes Proliferate)
1) Lymph Nodes
2) Spleen
3) Mucosal Associated Lymphoid Tissue (MALT)
Lymph Nodes
Locations:
- Cervical
- Axillary (armpit)
- Inguinal (groin)
- Intestinal
- Pelvic
Spleen
-Filters Blood
E.g. Removes Bacteria
Mucosal Associated Lymphoid Tissue (MALT)
- E.g. Tonsils, Appendix, Lymphoid tissues on mucous membranes
- Tonsils:
a) Adenoids = Pharyngeal (1) – nasopharynx
b) Palatine (2) - in oropharynx - commonly removed
c) Lingual (1) - base of posterior part of tongue
