Changes

*[[Bursa of Fabricius - Anatomy & Physiology|The Bursa of Fabricius]]

*[[Bursa of Fabricius - Anatomy & Physiology|The Bursa of Fabricius]]

*[[Thymus - Anatomy & Physiology|The Thymus]]

*[[Thymus - Anatomy & Physiology|The Thymus]]

*[[Haematopoiesis#Hepatic Phase|The Foetal Liver]]

*[[Haematopoiesis - Overview#Hepatic Phase|The Foetal Liver]]

Secondary (or peripheral) lymphoid tissues or secondary lymphoid organs provide a site for immune responses to occur and are populated by relatively mature [[Lymphocytes#T cells|T cells]] and [[Lymphocytes#B cells|B cells]], [[Macrophages|macrophages]] and dendritic cells; each tissue seems to be preferentially populated by lymphocyte types that specialise in the antigens that are most likely to be presented at that site. The secondary lymphoid tissues are:

Secondary (or peripheral) lymphoid tissues or secondary lymphoid organs provide a site for immune responses to occur and are populated by relatively mature [[Lymphocytes#T cells|T cells]] and [[Lymphocytes#B cells|B cells]], [[Macrophages|macrophages]] and dendritic cells; each tissue seems to be preferentially populated by lymphocyte types that specialise in the antigens that are most likely to be presented at that site. The secondary lymphoid tissues are: