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Located in secondary organs and tissues

Lymph nodes

T Cells

Maturation and immunocompetency in red bone marrow

B Cells

Maturation and immunocompetency in red bone marrow

Cisterra Chyli

Sac-like vessel

Thoracic & Lymphatic

Merge to form lymphatic trunks

Lymphatic Trunks

Merge to form lymphatic ducts

Cisterra CChyli

The thoracic duct begins here

Thoracic Duct

Drains the legs, abdominal area, and left side of the body

Right lymphatic duct

Drains the right side of thorax, arm, head, and neck

Thoracic duct

The longer lymphatic duct

Thoracic duct

Left lymphatic duct


Fluid that becomes interstitial fluid

Interstitial Fluid

Fluid that becomes lymph


Interstitial fluid plus blood cells and large proteins

Lymph nodes

filters lymph

Sites for the immune response

*Peyer's Patches
*Lymph node


Filters blood and contains red and white pulp


Programs T cells for immunocompetence

Red bone marrow

Programs B cells for immunocompetence

Regresses considerably with age


Largest lymphatic organ; red and white pulp


Bean-shaped; has efferent and afferent vessels

Lymph nodes

Primary lymphatic organs

Red bone marrow

Secondary lymphatic organs

Lymph nodes

Secondary lymphatic nodules associated with the nasal and oral cavities


Secondary lymphatic nodules located in connective tissue of mucous membranes


Secondary lymphatic nodules located in small intestine

Peyer's Patches


The fluid found within lymphatic vessels, is formed from blood plasma

Lymphatic Vessels

*Follow the pathway of veins in the body and also have a similar structure, but they have thinner walls and more valves than veins
* Flow into a series or chain of lymph nodes where lymph is filterd

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