Download 21. Lymphatics

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Transcript 
The
Lymphatic
System
Roles of the Lymphatic System
1) One-way drainage system.
2) Lipid Absorption from Small Intestine.
3) Produce & circulates Immune cells.
• Valves in lymphatic
vessels prevent
backflow of lymph.
Lymphoid Tissues:
Un-encapsulated lymphatic tissues
Tonsils
1) Pharyngeal
2) Palatine
3) Lingual
Tonsil located in strategic locations
Lymphoid Tissues
Lymphoid Organs:
Surrounded by fibrous capsule
(encapsulated)
Lymph Nodes
Thymus
Spleen
Structure of a Lymph Node
Various Lymph Nodes
•
•
•
•
•
•
•
Cervical lymph nodes
Axillary lymph nodes
Inguinal lymph nodes
Popliteal lymph nodes
Thoracic lymph nodes
Lumbar lymph nodes
Pelvic lymph nodes
Derivation and
Distribution of
Lymphocytes
T-cells
B-cells
The Thymus
• Behind the sternum
(in mediastinum).
• Where T cells Differentiate
The Spleen
Largest
lymphoid
tissue in
the body
The Spleen
Functions:
1) Removes old & abnormal blood cells.
2) Stores Iron (Fe) from recycled RBCs.
3) Can initiate immune response
(via T-cells B-cells).
4) Hematopoietic organ. Can store ~30%
of RBC volume for emergency release
Jugular trunks
Subclavian trunks
Bronchomediastinal trunks
Intestinal trunks
Lumbar trunks
Lymphatic
Vasculature:
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