Week 4 - Lymphatic System (Lymphoid organs and tonsils)

primary lymphoid organs

site where lymphocytes mature and proliferate; red bone marrow and thymus gland

bone marrow

tissue found inside bones; the site of all blood cell differentiation and maturation of B lymphocytes

red bone marrow

produces blood cells (haematopoiesis)

thymus gland

lymphoid organ in the mediastinum that conditions T cells to react to foreign cells and aids in the immune response

secondary lymphoid organs

lymph nodes and spleen

cervical lymph nodes

receive lymph from head and neck

axillary lymph nodes

concentrated in armpit, receive lymph from upper limb and female breast

mesenteric lymph nodes

Filter lymph from the digestive tract

inguinal lymph nodes

located in the inguinal (groin) area of the lower abdomen

spleen

An organ that is part of the lymphatic system; it produces lymphocytes, filters the blood, stores blood cells, and destroys old blood cells.

lymphoid nodules/follicles

unencapsulated patches of lymphoid tissue found throughout the body

pharynx

a muscular tube in the middle of your neck; passageway for food to the esophagus and air to the larynx

tonsil

mass of lymphoid tissue on either side of the throat at the back of the tongue

tonsillar crypts

portion of tonsils that trap and destroy bacteria and particulate matter.

nasopharyngeal tonsil

Tonsil located in the nasopharynx region.

Palatine tonsils

paired; oval, 12 x 25 mm; located in the oropharynx (region posterior to the oral cavity)

lingual tonsil

located at the base of the tongue