1.A small glandular organ that is situated behind the top of the breastbone, consisting mainly of lymphatic tissue and serving as the site of T cell differentiation. The thymus increases gradually in size and activity until puberty, after which it begins to atrophy. ...
The study of the thymic shadow shown on the roentgenogram was undertaken in the Newly Born Service of Touro Infirmary about three years ago with the idea of arriving at some definite conclusions as to the size, shape and position of the thymus. Examinations were made, beginning during the ...
What is the main function of the immune system? What is lymph and its function? What are the functions and characteristics of lymphocytes? Discuss the role of the thymus gland. Describe the cellular makeup and basic function of the thymus. ...
the involution, or shrinking, of the thymus, the cortex becomes thin. Lymphocytes disappear and are replaced byfat tissuefrom thepartitionsbetween the lobules. The process of involution is never complete, and the bits of thymus tissue that remain are probably sufficient to maintain its function. ...
The thymus co-evolved with the emergence of T lymphocytes, and its anatomical structure and function are preserved across vertebrate species (Ge and Zhao, 2013). Perhaps one of the most primitive forms of the thymus can be found in jawless fish, such as lampreys (Bajoghli et al., 2011;...
Aprimarylymphoidorgan,locatedinthesuperiormediastinumandlowerpartoftheneck,whichisnecessaryinearlylifeforthenormaldevelopmentofimmunologicfunction.Itreachesitsgreatestrelativeweightshortlyafterbirthanditsgreatestabsoluteweightatpuberty;itthenbeginstoinvolute,andmuchofthelymphoidtissueisreplacedbyfat.Thethymusconsistsoftwoirr...
It functions as the initial site of T cell immune maturation through positive and negative selection processes. T cells gain their name as they mature in the thymus and B cells are so named, as they mature in the bone marrow. This article will describe the anatomy, histology and function ...
The Thymus in Immunobiology: Structure, Function and Role in Disease An incisive review by Fisher analyzes thymus pathology in various human disease states. The major portion of the volume is devoted to studies of the kinetics, dynamics, and fates of thymus cell populations and the effect of thy...
8. Sudˉden death from thymus hypertrophy was closely associated with adrenal gland atrophy resulting in letdown of cortex function and decline of stress ability of the organisms. 胸腺肥大猝死与肾上腺萎缩导致的皮质功能减退和机体应激能力下降关系密切。
T cells (T lymphocytes) develop and mature in the thymus before entering the circulation. In humans, the thymus stops growing in early childhood and gradually shrinks in size through adulthood, resulting in a gradual decline in immune system function. The American Heritage® Science Dictionary ...