MeSH Trees

• Each tree is assigned a letter as an identifier
  
  

  A. Anatomy
  B. Organisms
  C. Diseases
  D. Chemical 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, Agriculture
  K. Humanities
  L. Information Science
  M. Named Groups
  N. Health Care
  V. Publication Characteristics
  Z. Geographic Locations
  

• Each MeSH term is located in one or more trees

• The tree structure goes from more general terms to more specific terms