Lymph Gland Zones
Lymph Gland Zones - Related Videos
04:20
Larval Lymph Gland Dissection: Isolating the Drosophila Hemocyte-Producing Organ
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2023
This video describes the Drosophila lymph gland—the primary site of hematopoiesis in the fly larva—and shows an example protocol to dissect and mount the organ for immunohistochemistry and fluorescent imaging.
11:49
Methods to Examine the Lymph Gland and Hemocytes in Drosophila Larvae
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Cited by 5 •
2016
Drosophila and mammalian hematopoietic systems share many common features, making Drosophila an attractive genetic model to study hematopoiesis. Here we demonstrate dissection and mounting of the major larval hematopoietic organ for immunohistochemistry. We also describe methods to assay various larval hematopoietic compartments including circulating hemocytes and sessile crystal cells.
08:41
Intravital Imaging of the Mouse Popliteal Lymph Node
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Cited by 27 •
2012
Recent advances in 2-photon microscopy have enabled real-time in situ imaging of live tissues in animal models, thereby enhancing our ability to investigate cellular behavior in both physiologic and pathologic conditions. Here, we outline the preparations required to perform intravital imaging of the mouse popliteal lymph node.
03:31
Dissection of Midgut and Salivary Glands from Ae. aegypti Mosquitoes
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Cited by 58 •
2007
The mosquito midgut and salivary glands are key entry and exit points for vector pathogens like Plasmodium falciparum and the dengue virus. This video demonstrates the dissection techniques for removing the midgut and salivary glands from Aedes aegypti mosquitoes.
08:06
Lymph Node Exam
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2023
Source: Richard Glickman-Simon, MD, Assistant Professor, Department of Public Health and Community Medicine, Tufts University School of Medicine, MA The lymphatic system has two main functions: to return extracellular fluid back to the venous circulation and to expose antigenic substances to the immune system. As the collected fluid passes through lymphatic channels on its way back to the systemic circulation, it encounters multiple nodes consisting of highly concentrated clusters of...
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Within cortical follicles, B lymphocytes are positioned where material carried by lymph can be encountered in an organized immune environment. Their activation can lead to clonal expansion, meaning production of many cells descended from an activated lymphocyte, and subsequent antibody production. This arrangement links antigen capture with amplification of a B-cell response rather than distributing those cells randomly through the node.
The paracortex brings T lymphocytes together with antigen-presenting cells, creating a specialized setting for immune-cell communication and activation. This organization helps connect recognition of material from lymph with the T-cell response that follows. In biology and histology, identifying this region is therefore important for understanding how cellular immune activity is coordinated within a lymph node.
The medullary region contains prominent antibody-secreting cells and macrophages, reflecting a later stage of immune processing within the node. Antibody-secreting cells contribute to the production of antibodies, while macrophages support capture and handling of material. Examining this region helps relate lymph-node structure to the movement from immune activation toward antibody output and material clearance.
Lymph enters through afferent vessels and moves through cortical and medullary sinuses before leaving the node. This passage exposes lymph-borne material to successive cellular regions, including areas rich in lymphocytes, antigen-presenting cells, antibody-secreting cells, and macrophages. The route provides an anatomical basis for coordinated antigen capture, lymphocyte activation, clonal expansion, and antibody production.
Histological interpretation can use the distribution of characteristic cell populations as a guide. Cortical follicles indicate concentrations of B lymphocytes, the paracortex contains T lymphocytes and antigen-presenting cells, and the medulla shows prominent antibody-secreting cells and macrophages. Comparing these patterns with the associated sinuses helps students connect microscopic organization with immune function.
These zones are useful when interpreting lymph-node histology and examining immune responses associated with inflammation, infection, or vaccination. Their organization provides a framework for asking where particular immune-cell activities occur and how those activities relate to lymph-borne material. The same framework also supports interpretation of pathological changes, including lymphoma or metastatic disease.
The normal compartmental arrangement establishes a reference for recognizing pathological changes in lymph nodes. Researchers and students can compare the expected distribution of B cells, T cells, antigen-presenting cells, antibody-secreting cells, and macrophages with altered tissue findings. This comparison is relevant when studying lymphoma, metastatic disease, inflammation, infection, or vaccination-related immune responses.