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MeSH Headings & Trees

An Introduction to MeSH

MeSH (Medical Subject Headings) is the controlled vocabulary of terms organized hierarchically into 16 trees. Each tree is assigned a letter as an identifier. MeSH can be viewed online at

A Anatomy
B Organisms
C Diseases
D Chemicals and Drugs
E Analytical, Diagnostic and Therapeutic Techniques and Equipment
F Psychiatry and Psychology
G Phenomena and Processes
H Disciplines and Occupations
I Anthropology, Education, Sociology and Social Phenomena
J Technology, Industry, and Agriculture
K Humanities
L Information Science
M Named Groups
N Health Care
V Publication Characteristics
Z Geographicals



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Last Reviewed: January 18, 2017