Lymphatic System

Lymphatic System functions to...

Maintain fluid balance by returning excess tissue fluid to the bloodstream.
Support immune defense by transporting and housing lymphocytes.
Facilitate absorption of lipids from the digestive tract.

Lymphatic Organs

Primary Lymphatic Organs

Red bone marrow-Produces WBCs. Site of hematopoiesis

and produces lymphocytes.

Thymus- Site of T-cell maturation

Secondary Lymphatic Organs

Lymph node- Small, encapsulated bean shaped organs that filter lymph. Filters lymph; houses immune cells.
Spleen- Filters blood, produces and filters WBCs, and is also involved in immune responses. Filters blood; destroys old RBCs.
Tonsils- Provide immune surveillance of inhaled and ingested substances. Trap pathogens entering through mouth or nose.
MALT- Immune defense at mucosal surfaces.

Lymph Flow and circulation

1. Formation

Plasma leaks from capillaries → becomes interstitial fluid → enters lymphatic capillaries → becomes lymph. Important for fluid balance; prevents tissue swelling.

2. Movement

Lymph moves via skeletal muscle contractions, respiratory movements, and valves in lymph vessels. Similar to venous return — movement prevents lymphedema.

3. Drainage Pathway

Lymph → lymphatic vessels → lymph nodes → lymphatic trunks → thoracic/right lymphatic ducts → subclavian veins. Ensures filtered lymph returns to bloodstream.

Lymph nodes

Small, bean-shaped structures along lymph vessels.
Contain macrophages and lymphocytes for immune surveillance.
Swell when actively filtering pathogens.

Tonsils

Pharyngeal (adenoids)- Located in the posterior nasopharynx. Trap inhaled pathogens. When infected

can swell and obstruct airway/nasal passage.

Palatine- Located on the sides of oropharynx. Trap ingested/inhaled pathogens. Commonly infected; may require tonsillectomy

Lingual- Located on the base of tongue. Trap pathogens from oral cavity. When infected can cause sore throat or difficulty swallowing.

Spleen

White pulp- Monitors blood for pathogens; contains lymphocytes.

Role in immune defense

Red pulp- Filters old/damaged RBCs; stores platelets. RBC recycling; stores blood for emergencies.

What happens if the spleen ruptures?

Can cause internal bleeding.
Often requires surgical removal (splenectomy).
Patients without a spleen are more vulnerable to bacterial infections and need vaccinations (e.g., pneumococcal).

Lymphedema- Lymphatic system fails to drain excess fluid from the tissues. Elevate limb, compression, gentle exercise

Tonsillitis- Inflammation of the tonsils due to viral or bacterial infection. Assess airway, fever, swallowing

Splenectomy- Surgical removal of the spleen.

Risk for infection; ensure vaccines given.

Lymphoma- Cancer of the lymph nodes. Observe for enlarged, painless nodes; fatigue; weight loss.

Clinical Questions

What are the primary lymphatic structures, and what are their functions?

Red bone marrow which is vital to WBC production and hematopoiesis. The thymus which is involved in T-cell maturation.

What are the secondary lymphatic structures, and how do they support immune function?

Lymph nodes, spleen, tonsils, and lymphatic nodules. They are sites of immune response initiation.

How is lymph formed and moved through the body?

Fluid leaves the blood capillaries and is not reabsorbed. It then becomes interstitial fluid and moves into lymphatic capillaries becoming lymph.

List the three types of tonsils and describe what happens when each is infected.

Pharyngeal tonsil- Can become inflamed, leading to a sore throat, and difficulty swallowing

Palatine tonsil- Can lead to tonsillitis, sore throat and difficulty swallowing

Lingual tonsil- Can lead to muffled voice, difficulty swallowing and a sore throat.

What is the function of the spleen, and what are the consequences of a ruptured spleen?

The spleen filters and monitors the blood. A ruptured spleen can cause internal bleeding.

How does the lymphatic system support immune defense and fluid balance?

Producing and housing WBCs that fight infections in organs like lymph nodes. Fluid balance is maintained by draining excess fluid, proteins, and waste from tissues and returning them into the bloodstream.

Why should nurses monitor lymph node swelling or spleen enlargement in patients?

This can mean early signs of infection or even leukemias and lymphomas. Spleen enlargement could eventually lead to a splenic rupture which can cause internal bleeding.

How can nurses help prevent or manage lymphedema in postoperative or oncology patients?

By educating patients on promoting regular assessments, risk reductions, and self management skills.

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