Mucosa-associated lymphoid tissue: Gut-associated lymphoid tissue | Peyer's patches The human lymphatic system The lymphatic system is a complex network of lymphoid organs, lymph nodes, lymph ducts, and lymph vessels that produce and transport lymph fluid from tissues to the circulatory system. ... Grays Anatomy illustration of cells in bone marrow. ... In human anatomy, the thymus is an organ located in the upper anterior portion of the chest cavity. ... Hassalls corpuscles (or thymic corpuscles) are structures in the thymus gland, composed of epithelial reticular cells. ... The spleen is a ductless, vertebrate gland that is closely associated with the circulatory system, where it functions in the destruction of old red blood cells in holding a reservoir of blood. ... The marginal zone is a portion of the spleen. ... The Palatine tonsils with the soft palate, uvula, and tongue visible. ... Most commonly, the term tonsils refers to the palatine tonsils that can be seen in the back of the throat. ... The lingual tonsils are rounded masses of lymphatic tissue that cover the posterior region of the tongue. ... Adenoids, or pharyngeal tonsils, are folds of lymphatic tissue covered by ciliated epithelium. ... The mucosa-associated lymphoid tissue (MALT) is the diffuse system of small concentrations of lymphoid tissue found in various sites of the body such as the gastrointestinal tract, thyroid, breast, lung, salivary glands, eye, and skin. ... Overview About 70% of the bodys immune system is found in the digestive tract. ... Peyers patches are secondary lymphoid organs named after the 17th-century Swiss anatomist Hans Conrad Peyer. ...

Lymph nodes: Cervical lymph nodes | Common iliac lymph nodes Deep inguinal lymph nodes | External iliac lymph nodes | Inferior mesenteric lymph nodes | Internal iliac lymph nodes | Lateral aortic lymph nodes | Paraaortic lymph node | Preaortic lymph nodes | Paratracheal chain | Retroaortic lymph nodes | Sentinel lymph node | Superficial inguinal lymph nodes | Virchow's node Structure of the lymph node. ... Cervical lymph nodes are lymph nodes found in the neck. ... The common iliac lymph nodes, four to six in number, are grouped behind and on the sides of the common iliac artery, one or two being placed below the bifurcation of the aorta, in front of the fifth lumbar vertebra. ... The deep inguinal lymph nodes are located medial to the femoral vein and under the cribriform fascia. ... The external iliac lymph nodes, from eight to ten in number, lie along the external iliac vessels. ... The inferior mesenteric glands consist of: (a) small glands on the branches of the left colic and sigmoid arteries (b) a group in the sigmoid mesocolon, around the superior hemorrhoidal artery (c) a pararectal group in contact with the muscular coat of the rectum They drain the descending iliac and... The internal iliac lymph nodes (or hypogastric) surround the hypogastric vessels, and receive the lymphatics corresponding to the distribution of the branches of the hypogastric artery, i. ... There are two groups of lateral aortic lymph nodes: right and left. ... The paraaortic lymph nodes (also para-aortic, periaortic, and peri-aortic) are a group of lymph nodes that lie in front of the lumbar vertebral bodies near the aorta. ... The sentinel lymph node is the hypothetical first lymph node reached by metastasizing cancer cells from a tumor. ... The superficial inguinal lymph nodes form a chain immediately below the inguinal ligament. ... In medicine (oncology), Virchows node is an enlarged, hard, left supraclavicular lymph node which can contain metastasis of visceral malignancy. ...

Lymph vessels: Thoracic duct | Right lymphatic duct | Cisterna chyli  | Lumbar trunk | Intestinal trunk In anatomy, lymph vessels are thin walled, valved structures that carry lymph away from the tissues, through the lymph nodes and thoracic duct back to the general circulation. ... In human anatomy, the thoracic duct is an important part of the lymphatic system — it is the largest lymphatic vessel in the body. ... The cisterna chyli (or receptaculum chyli) is a dilated sac at the lower end of the thoracic duct into which the intestinal trunk and two lumbar lymphatic trunks flow. ... The intestinal trunk receives the lymph from the stomach and intestine, from the pancreas and spleen, and from the lower and front part of the liver. ...

Lymph | Lymphocytes | Immune system In mammals including humans, the lymphatic vessels (or lymphatics) are a network of thin tubes that branch, like blood vessels, into tissues throughout the body. ... A lymphocyte is a type of white blood cell involved in the human bodys immune system. ... ...