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Medical Subject Headings
Medical Subject Headings (MeSH) is a comprehensive controlled vocabulary for the purpose of indexing journal articles and books in the life sciences; it serves as a thesaurus that facilitates searching. Created and updated by the United States National Library of Medicine (NLM), it is used by the MEDLINE/PubMed article database and by NLM's catalog of book holdings. MeSH is also used by ClinicalTrials.gov registry to classify which diseases are studied by trials registered in ClinicalTrials.gov.
MeSH was introduced in 1960, with the NLM's own index catalogue and the subject headings of the Quarterly Cumulative Index Medicus (1940 edition) as precursors. The yearly printed version of MeSH was discontinued in 2007 and MeSH is now available online only. It can be browsed and downloaded free of charge through PubMed. Originally in English, MeSH has been translated into numerous other languages and allows retrieval of documents from different languages.
==Structure of MeSH==
The 2009 version of MeSH contains a total of 25,186 ''subject headings'', also known as ''descriptors''.〔 Most of these are accompanied by a short description or definition, links to related descriptors, and a list of synonyms or very similar terms (known as ''entry terms''). These additional information and the hierarchical structure (see below) make the MeSH essentially a thesaurus, rather than a plain subject headings list.〔(Introduction to MeSH – 2010 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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