Lesson 7. Exploring the Interconnected World of the Lymphatic System: From Structure to Pathology

three functions of lymphatic system

fluid balance, fat absorption, immune defense

lymph/o

lymph fluid

lmyphaden/o

lmyph node (or glands)

lmyphangi/o

lymph vessel

splen/o

spleen

thym/o

thymus gland

lymphatic vessels are

thin-walled channels that resemble veins and are interwoven through nearly every tissue in the body

lmyph vessels transport

mixture of interstitial fluid, proteins, and white blood cells--away from the tissues and back toward the heart.- lymph

lymph is filtered through

lymph nodes

lymph nodes are

small, bean-shaped structures that trap foreign particles and contain immune cells such as lymphocytes and macrophages

spleen is located in

upper left quadrant of the abdomen

spleen function

filters blood, recycles old red blood cells and stores platelets and white blood cells

spleen plays a vital role in

mounting immune responses to blood-borne pathogens

thymus is located

behind the sternum

thymus is most active during

childhood and adolescence

thumbs serves as

maturation site for T cells which are crucial for adaptive immunity

as we age, thymus

shrinks (involution) but leaves behind robust population of T cells trained to recognize and destroy infected or cancerous cells

Acquired Immunodeficiency Syndrome (AIDS)

leads to the progressive destruction of CD4+ T lymphocytes, severely weakening the immune system and leaving the body vulnerable to opportunistic infections and cancers.

lymphoma

cancer of the lymphatic system, arises from lymphocytes gone rogue. The two major types are Hodgkin lymphoma and non-Hodgkin lymphoma.

hodgkin lymphoma

marked by the presence of Reed-Sternberg cells and tends to follow a predictable progression from one lymph node group to another

Non-Hodgkin Lymphoma

encompasses a broader category and can arise anywhere in the lymphatic system

mononucleosis

viral infection usually caused by the Epstein-Barr virus (EBV). It is characterized by fever, sore throat, and lymphadenopathy (swollen lymph nodes). In some cases, the spleen may also enlarge, and patients are advised to avoid contact sports to prevent splenic rupture.

lymphedema

swelling due to blocked lymphatic vessels

cattleman disease

rare outgrowth of lymph node tissue

lymphangitis

inflammation of lymph vessels, often fur to bacterial infection

CT

powerful imaging modality that provides cross-sectional views of the body. In the context of the lymphatic system, it is used to detect enlarged lymph nodes, tumors, or lesions in the spleen and thymus.

lymphangiography

involves injecting a contrast dye into the lymphatic vessels and taking X-rays to trace the flow of lymph fluid. Though less commonly used today due to the rise of MRI and PET imaging, it remains valuable in visualizing blockages, leaks, or tumors within the lymphatic system.

PET often combined with CT

is gold standard for staging and monitoring lymphomas. It highlights areas of increased metabolic activity, making it ideal for detecting malignancies or evaluating treatment response.

treating disorders of the lymphatic system requires

a strategic balance of eliminating disease, modulating immune response, and preserving overall health.

chemotherapy uses

cytotoxic drugs to kill rapidly dividing cells

egimens like R-CHOP (rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone) are frequently used in

non-Hodgkin lymphoma

chemotherapy can cause side effects like

fatigue, nausea, and immunosuppression

radiation therapy

delivers high-energy rays to kill cancer cells or shrink tumors. For localized lymphomas, radiation may be curative. It is also used palliatively to reduce pain or swelling caused by tumor masses. Advances in radiation techniques, such as intensity-modulated radiation therapy (IMRT), have minimized damage to surrounding healthy tissues.

antiviral therapy

is the primary treatment for HIV/AIDS. Modern antiretroviral therapy (ART) typically involves a combination of drugs that inhibit different stages of the HIV life cycle

immunoglobulin therapy is used

in individuals with immune deficiencies--either inherited or acquired--to bolster their immune defense by providing concentrated antibodies.

lymphedema

includes manual lymphatic drainage, compression therapy, and exercise regimens.

tonsils, Peyer's patches, and appendix

serves as the body’s first line of immune defense against ingested pathogens

immune tolerance is heavily dependent on the

health of the lymphatic system

disruptions in the lympathic system blance may lead to

chronic inflammation or autoimmunity. Conditions like systemic lupus erythematosus (SLE) and rheumatoid arthritis