UMLS Semantic Network The Semantic Network consists of (1) a set of broad subject categories, or Semantic Types, that provide a consistent categorization of all concepts represented in the UMLS Metathesaurus, and (2) a set of useful and important relationships, or Semantic Relations, that exist between Semantic Types. UMLS Semantic Types Ontology PyOBO v0.12.13-dev-207b46e9 on 2025-10-30T20:47:02.210530 by https://github.com/biopragmatics/pyobo/blob/main/src/pyobo/sources/umls/sty.py 2025AA https://lhncbc.nlm.nih.gov/semanticnetwork/ https://www.nlm.nih.gov/research/umls/knowledge_sources/semantic_network/semantic-network.png has category Activities & Behaviors Anatomy Chemicals & Drugs Concepts & Ideas Devices Disorders Genes & Molecular Sequences Geographic Areas Living Beings Objects Occupations Organizations Phenomena Physiology Procedures Organism Plant Fungus Virus Bacterium Animal Vertebrate Amphibian Bird Fish Reptile Mammal Human Anatomical Structure Embryonic Structure Congenital Abnormality Acquired Abnormality Fully Formed Anatomical Structure Body System Body Part, Organ, or Organ Component Tissue Cell Cell Component Gene or Genome Body Location or Region Body Space or Junction Body Substance Organism Attribute Finding Laboratory or Test Result Injury or Poisoning Biologic Function Physiologic Function Organism Function Mental Process Organ or Tissue Function Cell Function Molecular Function Genetic Function Pathologic Function Disease or Syndrome Mental or Behavioral Dysfunction Cell or Molecular Dysfunction Experimental Model of Disease Event Activity Behavior Social Behavior Individual Behavior Daily or Recreational Activity Occupational Activity Health Care Activity Laboratory Procedure Diagnostic Procedure Therapeutic or Preventive Procedure Research Activity Molecular Biology Research Technique Governmental or Regulatory Activity Educational Activity Machine Activity Phenomenon or Process Human-caused Phenomenon or Process Environmental Effect of Humans Natural Phenomenon or Process Entity Physical Object Manufactured Object Medical Device Research Device Conceptual Entity Idea or Concept Temporal Concept Qualitative Concept Quantitative Concept Spatial Concept Geographic Area Molecular Sequence Nucleotide Sequence Amino Acid Sequence Carbohydrate Sequence Regulation or Law Occupation or Discipline Biomedical Occupation or Discipline Organization Health Care Related Organization Professional Society Self-help or Relief Organization Group Professional or Occupational Group Population Group Family Group Age Group Patient or Disabled Group Group Attribute Chemical Chemical Viewed Structurally Organic Chemical Nucleic Acid, Nucleoside, or Nucleotide Amino Acid, Peptide, or Protein Chemical Viewed Functionally Pharmacologic Substance Biomedical or Dental Material Biologically Active Substance Hormone Enzyme Vitamin Immunologic Factor Indicator, Reagent, or Diagnostic Aid Hazardous or Poisonous Substance Substance Food Functional Concept Intellectual Product Language Sign or Symptom Classification Anatomical Abnormality Neoplastic Process Receptor Archaeon Antibiotic Element, Ion, or Isotope Inorganic Chemical Clinical Drug Clinical Attribute Drug Delivery Device Eukaryote