Johann Nepomuk Czermak


Johann Nepomuk Czermak was an Austrian-German physiologist who was a native of Prague.
He studied in Prague, Vienna, Breslau and Würzburg. At Breslau he was greatly influenced by the work of physiologist Jan Evangelista Purkyně. He became a professor at Graz in 1855, and proceeded to work at several European universities, including Krakow and Leipzig. Just prior to his death in 1873, he founded a physiological institute in Leipzig called the "Spectatorium". Czermak was a member of the Austrian Academy of Sciences.

Contributions

Czermak is remembered for his contributions made in the field of laryngology. Along with neurologist Ludwig Turck, he is credited for introducing the laryngoscope into medicine. The laryngoscope was created by Spanish singing instructor Manuel Garcia in 1854 — shortly afterwards, Czermak made modifications to the device, and it soon gained popularity in the medical world. Czermak is also credited for adapting the instrument for examination of the nose and nasopharynx.
He had a keen interest in phonetics, performing extensive studies on the role of the voice and acoustic conditions of the throat, mouth and nasal cavities in the production of consonants.
His name is associated with "Czermak's vagus pressure", described as mechanical pressure being applied to a location on the carotid triangle that causes a lowering of the heart rate and eventual loss of consciousness. He conducted research on spatial localisation of skin sensibility, and also demonstrated the influence of the nervus sympathicus in regards to excretion of saliva. In addition, he made contributions towards understanding a disorder that would later be known as Von Hippel–Lindau disease — showing that changes in the eyes' fundus was capillary angioma of the retina. For a period of time, the term "Hippel–Czermak syndrome" was used to reference the condition.

Selected writings