Lymphatic Histology

Flashcards covering key concepts related to lymphatic histology and immune system functions.

What are the major organs of the lymphatic system discussed in the class?

Thymus and Spleen.

What is the function of the Thymus in the immune system?

It is the site of T-cell production.

Define innate immunity.

Innate immunity is the immediate defense mechanism of the body, involving physical barriers and immune cells like neutrophils and natural killer cells.

What is humoral immunity?

Humoral immunity is a type of adaptive immunity that involves B cells producing antibodies.

What is the role of antigen presenting cells (APCs)?

APCs, like dendritic cells and B lymphocytes, help in the activation of T-lymphocytes by presenting antigens.

What is found in the white pulp of the spleen?

Aggregated lymphatic tissue, primarily consisting of B lymphocytes.

Describe the cortex of the thymus.

The cortex contains small lymphocytes and thymic epithelial cells that aid in the development of lymphocytes.

What distinguishes primary lymphatic nodules from secondary lymphatic nodules?

Primary nodules contain small, dormant lymphocytes, while secondary nodules have a germinal center for lymphocyte proliferation.

What is the pathway for lymph flow through a lymph node?

Afferent lymphatic vessel → Subcapsular sinus → Trabecular sinus → Medullary sinus → Efferent lymphatic vessel.

What are lacteals and their function?

Lacteals are blind-ending lymphatic capillaries in the GI tract that absorb fats and fat-soluble substances.