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Related Concept Videos

Primary Lymphoid Organs01:16

Primary Lymphoid Organs

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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
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Development of the Lymphatic System01:15

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The development of lymphatic tissues and vessels in embryonic life begins around the fifth week. These structures originate from the mesoderm layer, with lymph sacs emerging from developing veins.
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...
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Secondary Lymphoid Organs01:15

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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...
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The Thyroid Gland01:23

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Lymphoid Cells and Tissues01:18

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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Cells of the Adaptive Immune Response01:23

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Updated: Nov 23, 2025

Two-step Approach to Explore Early- and Late-stages of Organ Formation in the Avian Model: The Thymus and Parathyroid Glands Organogenesis Paradigm
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Revisiting the Teleost Thymus: Current Knowledge and Future Perspectives.

Felipe Barraza1, Ruth Montero2, Valentina Wong-Benito1

  • 1Laboratory of Immunology, Center of Aquatic Biotechnology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Av. Bernardo O'Higgins, Estación Central, Santiago 3363, Chile.

Biology
|December 30, 2020
PubMed
Summary
This summary is machine-generated.

The fish thymus is crucial for T-lymphocyte production. This review details its location, histology, cell types, function, and how environmental factors like photoperiod impact thymus development in teleost fish.

Keywords:
CD4 T cellsCD8 T cellsrainbow troutteleostthymus

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Area of Science:

  • Comparative immunology
  • Vertebrate evolution

Background:

  • The thymus is vital for T-lymphocyte production in vertebrates.
  • It first appeared in jawed cartilaginous fish, typically as a paired subcutaneous organ.

Purpose of the Study:

  • To review thymus localization, histology, cell composition, and function in teleost fish.
  • To examine environmental influences on thymus development and T-cell production.

Main Methods:

  • Literature review of existing studies on fish thymus.
  • Analysis of thymus localization, histology, and cellular components.
  • Evaluation of environmental factors affecting thymus development.

Main Results:

  • The thymus in teleost fish exhibits specific localization and histological features.
  • Environmental factors like photoperiod, temperature, and hormones significantly influence thymus development and function.
  • Understanding thymus dynamics is key to fish immunobiology.

Conclusions:

  • Further research on thymus cell distribution and function is needed.
  • Investigating how external factors modulate thymus dynamics will advance fish immunology.
  • Identifying knowledge gaps is essential for future studies on fish thymus immunobiology.