Dryander was born in Wetter, Holy Roman Empire as Johannes Eichmann.
[3] His Anatomiae pars prior, an expanded edition published in 1537, marked a significant transition from medieval scholasticism to the precise observations of Andreas Vesalius.
[3] Dryander's books featured detailed illustrations of the brain, skull, and cranial sutures, reflecting his personal use of dissections.
[3] His translation of Mundinus' anatomy in 1542 drew the ire of the anatomist as it plagiarized a portion of Vesalius' Tabulae sex.
[3] His early books, as products of rational scientific thought, contributed significantly to the development of modern anatomy.