Anatomy Atlases: Anatomical Variants

Illustrated Encyclopedia of Human Anatomic Variation

A collection of variations curated by Ronald A. Bergman et al:

We believe that the use of the terms anomaly and abnormality convey an idea of pathology, something strange, probably never to be seen again, a true "lusus naturae" (sport of nature). Many or most variations are totally benign; some are errors of embryologic developmental timing or persistence of an embryologic condition. Some of these variations may seriously compromise parts of the muscular, vascular, nervous, skeletal and/or other organ systems; they are all fascinating because they teach us about our development, and something about our genetic heritage.