Search results
Results from the WOW.Com Content Network
There are about 1 million islets distributed throughout the pancreas of a healthy adult human. While islets vary in size, the average diameter is about 0.2 mm. [5]:928 Each islet is separated from the surrounding pancreatic tissue by a thin, fibrous, connective tissue capsule which is continuous with the fibrous connective tissue that is interwoven throughout the rest of the pancreas.
Langerhans cell is represented by a yellow oval; blue arrows correspond to is_a relations, and orange arrows correspond to develops_from relations. Only a subset of Langerhans cell parent types are included in the figure. [1] A Langerhans cell (LC) is a tissue-resident macrophage of the skin [2] once thought to be a resident dendritic cell. [3]
Histiocytic diseases in dogs are a group of diseases in dogs which may involve the skin, and which can be difficult to differentiate from granulomatous, reactive inflammatory or lymphoproliferative diseases. The clinical presentation and behaviour as well as response to therapy vary greatly among the syndromes.
Paul Langerhans (25 July 1847 – 20 July 1888) was a German pathologist, physiologist and biologist, credited with the discovery of the cells that secrete insulin, named after him as the islets of Langerhans.
Once the activated lymphocytes arrive, they get in contact with the antigen, they proliferate and develop their effector functions in order to neutralize or eliminate the pathogen. The Langerhans cells promote and permit the start of the cellular immune response of lymphocytes through the skin and are recruited from the peripheral blood.
The pancreatic islets, where PP cells reside, was discovered in 1869 by a German pathological anatomist and scientist, Paul Langerhans. PP cells help to make up the pancreas but are smallest in proportion to the other cells previously stated. The proportions can vary based on which animals are being studied, but in humans, PP cells make up less ...
Dermal macrophages' functions suggest their importance in the skin’s innate immunity. Dermal macrophages, Langerhans cells and dendritic cells are the main types of antigen-presenting cells (APCs) in the skin. However, dermal macrophages have a relatively lower influence on antigen-presenting than other APCs.
The disease spectrum results from clonal accumulation and proliferation of cells resembling the epidermal dendritic cells called Langerhans cells, sometimes called dendritic cell histiocytosis. These cells in combination with lymphocytes , eosinophils , and normal histiocytes form typical LCH lesions that can be found in almost any organ . [ 5 ]