system consisting of lymphatic vessels, lymph nodes, and other lymphoid organs and tissues, drains excess tissue fluid from the extracellular space and provides a site for immune surveillance.
an elaborate system of drainage vessels that collect the excess protein-containing interstitial fluid and return it to the bloodstream.
the milky white, fatty lymph that drains from the digestive viscera and is also delivered to the blood via the lymphatic stream.
the main warriors of the immune system that arise in red bone marrow. They mature into either T or B cells that protect the body against antigens.
lymphocytes that manage the immune response and some of them directly attack and destroy infected cells.
lymphocytes that protect the body by producing plasma cells that secrete antibodies into the blood.
daughter cells produced by B cells that secrete antibodies into the blood.
lymphatic cells that play a crucial role in body protection and in the immune response by phagocytizing foreign substances and by helping to activate T cells.
spiny-looking cells that capture antigens and bring them back to the lymph nodes
fibroblast-like cells that produce the stroma.
the network that supports the other cell types in the lymphoid organs.
an important component of the immune system because it houses and provides a proliferation site for lymphocytes and furnishes and ideal surveillance vantage point for lymphocytes and macrophages. Largely composed of reticular connective tissue.
Reticular Connective Tissue
a type of loose connective tissue that dominates all the lymphoid organs except the thymus. Macrophages live on its fibers.
the principal lymphoid organs in the body which cluster along the lymphatic vessels of the body. Filter lymph and activate the immune system
connective tissue strands that extend inward to divide the node into a number of compartments.
soft, blood-rich organ about the size of a fist and is the largest lymphoid organ. Located in the left side of the abdominal cavity just beneath the diaphragm. Provides site for lymphocyte proliferation and immune survellance and response. Cleanses blood, stores breakdown products of RBCs, site of erythrocyte production in fetuses, and stores blood platelets.
Areas composed of mostly lymphocytes suspended on reticular fibers. Involved with the immune functions of the spleen.
all the remaining splenic tissues (the venous sinuses and the splenic cords) Most concerned with disposing of worn-out RBCs and blood borne pathogens.
regions of reticular connective tissue rich in macrophages.
has important functions primarily during the early years of life. FOund in the inferior neck and extends into the superior thorax. Secretes thymopoietin and thymosins and causes T lymphocytes to become immunocompetent. Functions strictly in T lymphocyte maturation so does not directly fight antigens and the stroma consists of epithelial cells rather than reticular fibers.
the simplest lymphoid organs that form a ring of lymphatic tissue around the entrance to the throat. Invites infections to provide improved immunity later on.
a tubular offshoot of the first part of the large intestine. Along with Peyer's patches, destroys bacteria thereby preventing these pathogens from breaching the intestinal wall and generates memory lymphocytes for longterm immunity.