![]() Instead, SCRs are mapped to the headings in descriptor records.ĭue to synonyms, the number of terms that can be mapped to records far exceeds the number of records. SCRs consist mostly of names of substances, having headings and synonyms, but not tree numbers. Qualifiers are terms that are used with a descriptor to define the domain of the study for which the descriptor is applied. A descriptor may have more than one tree numbers (thus, the MeSH hierarchy is not a tree but a lattice). Descriptors are hierarchically organized sets of medical concepts, and a descriptor record has a heading (a term in a controlled vocabulary for describing the subjects of articles), entry terms (synonyms to the heading), tree numbers (positions in the hierarchy), scope note (the definition of the subject, in natural language text), and other information. As of 2018, MeSH contained 28,939 descriptors, 79 qualifiers, and 244,778 SCRs, with each mapped to a unique ID (MeSH ID). MeSH consists of descriptors, qualifiers, and supplementary concept records (SCRs). National Library of Medicine (NLM) for indexing and cataloging biomedical research articles. MeSH is a medical thesaurus developed and maintained by the U.S.
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