1-6 The Lymphoid System and Lymphocyte Circulation Flashcards
Afferant lymphatics
Lymphatic Vessels entering lymph nodes from tissue spaces.
Efferent Lymphatics
Lymphatic Vessels leaving lymph nodes and returning lymph to the blood stream.
Follicle
(of lymphoid tissue) B cell area of secondary lymphoid tissue.
Germinal Center
Site of vigorous proliferation of B cells in the B cell follicles of secondary lymphoid organs.
Lymph
Fluid drained from the tissues and flowing through lymphatic vessels.
Lymphatic Vessels
System of vessels draining fluid from the tissues in which dendritic cells and antigens are delivered to lymph nodes.
Lymph Nodes
Secondary lymphoid organs distributed widely in the body but especially in the groin, the axilla and the neck, and along the small intestine.
Lymphoid Chemokine
Constitutively expressed chemoattractant molecule that directs the migration of lymphocytes and dendritic cells into specialized regions of the secondary lymphoid tissues. Also known as homeostatic chemokine.
Mucosa-associated Lymphoid Tissues (MALT)
Secondary lymphoid tissue in the walls of the gastrointestinal, respiratory and urogenital tracts.
Paracortical Area
(of lymph node) Area beneath the outer regions of the lymph node and where T lymphocytes accumulate.
Periarteriolar Lymphoid Sheath (PALS)
T cell area in the spleen, formed around arterioles.
Peyer’s patches
Organized regions of secondary lymphoid tissue in the walls of the small intestine.
Primary Lymphoid Tissues
Bone marrow and thymus, in which lymphocytes differentiate and mature.
Red Pulp
Site of destruction of senescent red blood cells in the spleen.
Secondary Lymphoid Tissues
Tissues in which lymphocytes are brought together with antigen and adaptive immune response are initiated.
