The VARIANTIS Encyclopedia organizes human anatomical variation by anatomical system and structural domain. Each entry is structured around morphology, classification systems, available evidence and prevalence, topographical relationships, and morphology-derived clinical significance.
Browse by anatomical system and structural domain
Muscular System
Entries documenting variation of skeletal muscles and tendons, including presence or absence, accessory heads and slips, origin and course, attachment morphology, fusion patterns, classification systems and topographical relationships.
Vascular System
Entries documenting arterial, venous and lymphatic variation, including origin, course, branching, anastomotic patterns, accessory or persistent vessels, absence and topographical relationships.
Nervous System
Entries documenting variation of peripheral and central nervous structures, including configuration, course, branching patterns, communications, plexus morphology and topographical relationships.
Visceral and Organ Systems
Entries documenting anatomical variation of gastrointestinal, genitourinary, respiratory, endocrine and other organ systems, with emphasis on positional variation, structural patterns and documented anatomical relationships.
Skeletal, Articular and Ligamentous Structures
Entries documenting skeletal, articular and ligamentous variation, including accessory bones, foramina, canals, sesamoid structures, joint morphology, ligamentous variants and related topographical anatomy.