What are the main parts of the mesh medical thesaurus?

Published by the National Library of Medicine (NLM).

The noun interpretation of the medical thesaurus is: a terminology control tool that converts the natural language of the person indexing the literature or the user into standardized noun terms; It is a standardized dynamic dictionary that summarizes all branches of medicine and is composed of terms related to semantics and clans.

In 1960, NLM compiled and published the Medical Subject Heading (Mesh). The table collects more than 10,000 subject words, and sets up various references and annotations, and 82 inscriptions of the deputy master Zheng Nai. Subject headings and subheadings are normalized words.

Mesh is a dynamic vocabulary that changes a certain number of words every year in order to keep pace with scientific developments. It is the basis for NLM's indexing of medical literature, and it is also the entry point for users to search the Index of Pulse Medicine.

The Thesaurus of Medical Topics consists of two main parts.

The first part is the alphabetical list arranged by the word order of the subject headings, and the second part is the "tree structures", also known as the "category table".

The role of the medical thesaurus:

1. Ensure the standardization of subject words;

2. Ensure that the words used by the literature as the basis of the group, the indexer and the searcher are consistent;

3. Provide a thematic approach for search tools.

Types of Medical Thesaurus:

1. Annotation of medical subject words in word order;

2. Wheel table (machine-readable version);

3. Tree structure table (classification table).

In medical keywords (mesh), sub-topics are the common aspects of the subject words Beihui, such as the "**", "nursing", "diagnosis" and other aspects of the disease keywords, and the "** application" and "pharmacokinetics" of the drug keywords.

<> medical subject vocabulary (medical subject headings).

There are a total of 83 sub-subject headings in the mesh vocabulary, and its function is to limit the subject headings to improve the specificity of the subject headings, not every sub-topic can be matched with all the subject words, but only with the theme words in those categories indicated in the parentheses.

There are a total of 92 sub-headings in the mesh vocabulary, which is used to qualify the subject headings and improve the specificity of the subject headings.

Medical subject headings (MESH) is an authoritative thesaurus compiled by the Medical Library. It is a normalized, extensible, dynamic thesaurus.

The Medical Library uses it as the basis for biomedical indexing, compiles the Index Medicus and establishes the MEDLINE database, an online computer literature retrieval system. Mesh brings together more than 18,000 medical keywords.

The important role of mesh in literature retrieval is mainly manifested in two aspects: accuracy (accurately revealing the subject matter of the content of the document) and specificity. In the process of indexing (the process of subject analysis of the literature and the conversion from natural language to standardized retrieval language), the personnel input the information into the retrieval system and the searcher (user) uses the information in the system to eliminate the subject words as the standard terms, so that the terms used between indexing and retrieval are consistent and the best retrieval effect is achieved.

2) When searching, after the user enters a subject heading, the system will automatically display the sub-subject headings that can be combined with the subject heading. "Mesh" has a sub-thesaurus, with 77 sub-themes used by IM from 1989 to 1990 and 80 from 1991 to 1994, with slight changes from year to year. Currently, there are 92 subheadings used by IM.