Embryology, anatomy, and diseases of the umbilicus together with diseases of the urachus

Contains the first reference to what would become known as “Cullen’s sign”, discoloration of the skin about the umbilicus, as a sign of ruptured ectopic gestation. This work contains extraordinary illustrations by Max Brödel, including a series of truly remarkable variations in belly buttons. Digital facsimile from the Internet Archive at this link.