Illustrated Encyclopedia of Human Anatomic Variation: Opus V: Skeletal Systems
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
The upper illustration shows a sacrum composed of five vertebrae and coccyx composed of four vertebrae (Tabulae Sex, 1538). The lower drawing shows a sacrum composed of six vertebrae and coccyx composed of four vertebrae (Fabrica, 1543).
From Vesalius, A. Tabulae Sex, 1538, and Fabrica, 1543. In Straus, W.L. Jr. and O. Temkin. Vesalius and the problem of variability. Bull. Hist. Med. 14:609-633, 1943.
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