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Encyclopedia > Paracortex

Paracortex is the portion of a lymph node immediately surrounding the cortex. Unlike the cortex, which has mostly B cells, the paracortex has mostly T cells. Structure of the lymph node. ... Look up cortex in Wiktionary, the free dictionary. ... B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response). ... T cells are a subset of lymphocytes that play a large role in the immune response. ...

External links

  • Histology at BU 07102loa - "Lymphoid Tissues and Organs: lymph node, cortex and medulla"
  • Diagram at le.ac.uk
  • Slide at iupui.edu
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Lymphatic system
Bone marrow | Thymus (Hassall's corpuscles) | Spleen (White pulp, Periarteriolar lymphoid sheaths, Marginal zone, Red pulp) | Tonsils (Palatine, Lingual, Adenoid)

Mucosa-associated lymphoid tissue: Gut-associated lymphoid tissue | Peyer's patches For the unrelated Jesuit university in Chestnut Hill, see Boston College. ... 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 altered coat of the arterioles, consisting of adenoid tissue, presents here and there thickenings of a spheroidal shape, the white pulp (Malpighian bodies of the spleen, splenic lymphoid nodules). ... Periarteriolar lymphoid sheaths (or periarterial lymphatic sheaths, or PALS) are a portion of the white pulp of the spleen. ... The marginal zone is a portion of the spleen. ... The red pulp (also called splenic pulp, but should not be confused with white pulp) is a soft mass of a dark reddish-brown color, resembling grumous blood It consists of a fine reticulum of fibers, continuous with those of the splenic trabeculae, to which are applied flat, branching cells. ... 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: Subcapsular sinus | Paracortex | head and neck (Cervical, Virchow's) | iliac (External, Common, Internal) | lumbar/paraaortic (Lateral aortic, Preaortic, Inferior mesenteric, Retroaortic) | inguinal (Deep, Superficial) | Axillary Structure of the lymph node. ... Cervical lymph nodes are lymph nodes found in the neck. ... In medicine (oncology), Virchows node is an enlarged, hard, left supraclavicular lymph node which can contain metastasis of visceral malignancy. ... The external iliac lymph nodes, from eight to ten in number, lie along the external iliac vessels. ... 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 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 preaortic lymph nodes lie in front of the aorta, and may be divided into celiac, superior mesenteric, and inferior mesenteric groups, arranged around the origins of the corresponding arteries. ... 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 retroaortic lymph nodes (or postaortic lymph nodes) are placed below the cisterna chyli, on the bodies of the third and fourth lumbar vertebrae. ... The deep inguinal lymph nodes are located medial to the femoral vein and under the cribriform fascia. ... The superficial inguinal lymph nodes form a chain immediately below the inguinal ligament. ... The Axillary lymph nodes are of large size, vary from twenty to thirty in number, and may be arranged in the following groups: 1. ...

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 right lymphatic duct, about 1. ... 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 lumbar trunks are formed by the union of the efferent vessels from the lateral aortic lymph glands. ... 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 | High endothelial venules | 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. ... High endothelial venules, or HEVs, are a subtype of blood endothelium present within lymph nodes; used by various leukocytes to gain entry into the lymph node via the blood. ... The immune system protects the body from infection by pathogenic organisms. ...



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