thymus gland
Học thuậtThân thiện
Definition
Noun: * A small, ductless glandular organ located in the upper chest, behind the breastbone and between the lungs. It is part of the lymphatic and endocrine systems and is most active during childhood and adolescence. Its primary functions are to produce and mature specific white blood cells called T-lymphocytes (T-cells), which are crucial for the adaptive immune system, and to secrete hormones. This organ typically shrinks and is replaced by fatty tissue after puberty.
Examples of Usage
- Noun:
- The thymus gland is essential for the development of a healthy immune system in infants and children.
- Surgeons must take care not to damage the thymus gland during cardiac procedures.
- In some autoimmune disorders, the thymus gland may be abnormally active or enlarged.
Advanced Usage
- Medical Context: The term is primarily used in medical, biological, and anatomical contexts. It is often simply called "the thymus."
- The biopsy confirmed the tumor originated in the thymus.
- Immunology: Frequently discussed in relation to T-cell maturation and central tolerance (the process of preventing the immune system from attacking the body's own tissues).
- Immature lymphocytes migrate from the bone marrow to the thymus gland to undergo selection.
Variants and Related Words
- Thymus (noun): The more common short form of "thymus gland."
- Thymic (adjective): Relating to the thymus gland.
- Thymic hyperplasia is an enlargement of the gland.
- Thymocyte (noun): An immature lymphocyte within the thymus.
- Thymopoietin, Thymosin (nouns): Hormones secreted by the thymus gland.
Synonyms
- Thymus: The direct synonym.
- Primary lymphoid organ: A categorical synonym, as the thymus is one of the primary organs where lymphocytes are generated and mature (the other being the bone marrow).
Related Phrases and Concepts
- Thymus-dependent lymphocyte: Another name for a T-lymphocyte or T-cell, highlighting its origin.
- Thymic involution: The natural, age-related process where the thymus gland atrophies and loses its functional tissue.
- Thymectomy (noun): The surgical removal of the thymus gland.
Noun
- a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age