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Terms in this set (36)
filters blood & stores platelets and other blood products for RBC production
found in clusters along lymph vessels throughout the body and filters circulating lymph fluid
Mucosa-associated lymphoid tissue
monitors & removes pathogens from the intestinal tract
produces the hormone thymosin which is important for stimulating the development of T lymphocytes
removes pathogens that enter the pharynx in food or inhaled air
Cortex of a lymph node
Composed of lymphoid nodules and diffuse lymphoid tissue; look for purple staining cells around outside of lymph node. The outermost layer is protected and anchored by a capsule made of dense connective tissue.
lymphoid nodule (follicle) of lymph node
These are centers for developing B lymphocytes. Typically found in the outer cortex
These cells screen lymph looking for antigens, differentiate into plasma cells, and then produce antibodies.
These cells interact with antigen-presenting cells to either destroy them, prompt other immune cells to take action, or turn off the immune response. They are abundant in the inner cortex.
Medulla of lymph node
This region is composed of medullary cords and sinuses that filter lymph.
medullary cords of a lymph node
Dense collection of B and T lymphocytes, plasma cells, macrophages, and reticular cells that filter lmyph as it passes by.
medullary sinuses of a lymph node
Lymph flows through channels between medullary cords in these sinuses. They eventually converge to form the efferent lymphatic vessel.
Palatine tonsils x2
These two tonsils are located in the back of the oral cavity (the ones you can see in the mirror), the centers of the tonsils contain diffuse lymphoid tissue and many organized lymphoid nodules.
- the mucosa lining these tonsils is protected from abrasion by nonkeratinized stratified squamous epithelium.
- crypts: The mucosal lining epithelium runs deep into the body of the tonsil to increase surface area between the contents of the nose and mouth, and the immune cells of the lymphoid tissue.
- capsule: Connective tissue separates some (but not all) of the tonsil from the underlying body tissue.
pharyngeal (adenoid) tonsil x1
This single tonsil is located at the back of the nasal cavity. The center of the tonsil contains diffuse lymphoid tissue and many organized lymphoid nodules.
- The mucosal lining of this tonsil is protected by respiratory epithelium (ciliated pseudo-stratified columnar epithelium). Cilia can help move particles away from the esophagus and trachea.
- capsule: Connective tissue separates some (but not all) of the tonsil from the underlying body tissue. The capsule can wall-off an infection to keep it from spreading into the underlying body tissue.
lingual tonsils x2
These two tonsils are located at the base of the tongue going into the throat.
- The mucosal lining of these tonsils is protected from abrasion by non keratinized stratified squamous epithelium
- crypts: The mucosal lining epithelium runs deep into the body of the tonsil to increase surface area between the contents of the nose and mouth and the immune cells of the lymphoid tissue.
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