 Specifically, Messerklinger focused on mapping out mucociliary routes.In 1978, Messerklinger published the book titled "Endoscopy of the Nose" on his findings, and his proposed methods to utilize nasal endoscopy for diagnosis.After learning of Messenklinger's endoscopic techniques, David Kennedy, MD, and Karl Storz, MD, of Johns Hopkins University developed instruments for use in endoscopic sinus surgery, and coined the term Functional Endoscopic Sinus Surgery.