immune self-hiding

Referred to as Tr cells, helper T cells and B cells. HIV can specifically destroy Tr cells, causing paralysis of the immune system.

Tc cells, referred to as Tc cells, can directly attack heterotypic cells, virus-infected cells and certain tumor cells that enter the body; they can secrete granzymes and induce the death of target cells.

Tr cells for short, directly or indirectly inhibit the proliferation, differentiation and activity of antigen-specific T cells.

Thymic epithelial cells secrete thymosin and thymopoietin

Thymocytes account for 80-90%, filling in the spaces between thymus epithelial cells

There are many medullary epithelial cells, which secrete thymosin and partially constitute thymic corpuscles, which grow with age.

Few thymocytes

It is composed of lymph nodes and diffuse lymphoid structures between the nodes, which is the B cell area.

It is the subcortical layer and is a large area of ​​diffuse lymphoid tissue, mainly composed of Tr cells, also known as the thymus-dependent area.

Divided into subcapsular sinuses and trabecular sinuses - lymph flows slowly in the sinuses, which is beneficial to macrophages in clearing antigens

Interconnected cord-like lymphocytes contain mainly B cells, T cells and a large number of plasma cells, and high endothelial venules can be seen

More macrophages, stronger filtration ability

Equivalent to the paracortical layer, with a large number of T cells and no high endothelial venules

A large number of B cells

There are more macrophages and there are marginal sinuses, which are channels for internal blood antigens and lymphocytes to enter the white pulp.