[The art of surgery in nuce : Introduction to Institutiones chirurgicae (1601) by Johannes Jessenius (1566-1621)].

Background: In 1601, Johannes Jessenius published the surgical work Institutiones chirurgicae, which is of particular importance for the history of surgery in Germany. So far, research has predominantly concentrated on the anatomical works of Jessenius; his surgical work including aspects of urology has not been the subject of investigation.
Objectives: In the present article, we analyze the structure, reasoning, and linguistic means used by the author in this work.
Results: According to the introduction, surgery comprises three basic components: agens, actor or the surgeon, actio, the activity, that is, the operation, and per quae et quibus actio perficitur, which means instruments and medications. The operations are arranged in contrasts, solutio continuorum-junctio separatorum, the dissolution of the connected-connection of the separate, extirpatio superfluorum-recuperatio deficientium, to eliminate the superfluous-to restore the missing. The description of the instruments is also based on opposite pairs.
Discussion: The three elements of surgical work represent a reduction of what is stated in the Hippocratic text De officina. Thus, recognizable here is an ancient tradition, which was also known to the predecessors of Jessenius.
Conclusions: At the beginning of the work, aspects of an introduction to the surgical work of the 16th century are briefly recapitulated. Jessenius adheres to this historical tradition including aspects of urology of this work. In the introduction, he refers to various medical writers, without directly adopting the texts. The surgical artistry that Jessenius stands for is of fundamental importance to this day.