# /research/projects/termservices/resources/mesh.htm

originally: http://www.oclc.org/research/projects/termservices/resources/mesh.htm

# MeSH

## Vocabulary:

  MeSH® — Medical Subject Headings vocabulary

## Description:

  The Medical Subject Headings (MeSH®) thesaurus is a controlled vocabulary produced by the National Library of Medicine and used for indexing, cataloging, and searching for biomedical and health-related information and documents.

  The MeSH® 2005 vocabulary contains 22,995 descriptor records, 83 qualifier records, and 509,645 descriptor/qualifier combinations, for a total of 532,723 records.

  The MeSH® 2006 vocabulary contains 23,885 descriptor records, 83 qualifier records, and 534,976 descriptor/qualifier combinations, for a total of 558,944 records.

## Expressions:

  20050110

    The value '20050110' is used as «expr» for the info:kos info:kos URI specification and corresponds to the date, 10 January 2005, when the MeSH® 2005 MARC download page was last updated on the U.S. National Library of Medicine, National Institutes of Health, Health & Human Services Web site.

  20051209

    The value '20051209' is used as «expr» for the info:kos info:kos URI specification and corresponds to the date, 09 December 2005, when the MeSH® 2006 MARC download page was last updated on the U.S. National Library of Medicine, National Institutes of Health, Health & Human Services Web site.

## Resources:

  MARC21 MARC-XML
    - Files
    - Field and Subfield Statistics
  Experimental Interfaces
    - Terminologies Services Pilot Terminologies Services Pilot

## Related Resources:

  Medical Subject Headings
    - Medical Subject Headings (MeSH®) Fact Sheet
    - Medical Subject Headings (MeSH®) Online Browser
    - 2005 MeSH®/MARC
    - 2006 MeSH®/MARC
  Project-related standards

Please send comments or questions to: kos@oclc.org.