TAMU Biol 320: Module 9
Reed-Sternberg cells
characteristic of Hodgkin's disease and are derived from B lymphocytes (crippled germinal center B cells), meaning they have not undergone hypermutation to express their antibody moth eaten appearance
Taste buds
clusters of encapsulated gustatory receptor cells located mostly on the surface of the tongue concentrated on peg like projections (papillae)
lymphatic system function
collect and filter lymph; teems w/macrophages T and B cells
tonsils
collections of lymphatic tissue associated with the inside of the throat and mouth (located at base of tongue and back of mouth)
Diffused lymphoid organ
do not have a defined boundary that separates them from the CT found in every body organ
lymph node
encased in a dense CT capsule scattered throughout lymphatic system w/high concentrations in upper limbs, axillary, & cervical regions
spleen
largest lymphoid organ (lateral to the stomach) capsule surrounds to protect red & white pulp entraps & destructs old erythrocytes & platelets
Hassall's corpuscles
looks like a big mess of cells in medullary area of thymus sites that accumulate dead T cells involved in the development of regulatory T cells that help prevent autoimmune responses
encapsulated lymph organs
lymph nodes, thymus gland, and spleen each separated from surrounding connective tissue (CT) by a fibrous capsule
crown
part above the gum line (gingival margin)
red pulp
part of the spleen in which blood flows through as free and fixed phagocytes in the pulp remove abnormal RBCs and other antigens
white pulp
part of the spleen that appears blue due to the lymphocyte nuclei stains sensitized to antigens and produce antibiotics to counteract them
gustatory epithelial cells
receptor cells for taste
lymphatic system
returns fluids tat have leaked from vessels back into blood via lymphatic vessels, lymph, and lymph nodes
basal epithelial cells
stems cells that divide to produce new gustatory epithelial cells
lymph follicles
w/in lymph node active center for B cell mitosis
Hodgkin's granuloma
a cancer of the lymphatic system; untreated cancerous overgrowth can lead to breakdown of both red and white pulp
