Jean Casimir Félix Guyon
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Jean Casimir Félix Guyon (July 21, 1831 - August 2, 1920) was a French surgeon and urologist who was born on Ile-Bourbon (Réunion). He studied medicine in Paris and received his doctorate in 1858.
For much of Guyon's career, he was a surgeon at Hôpital Necker and a professor in Paris. In 1890 he became the first Professor of Urology in Paris. In 1907 Guyon and a handful of other urologists established the International Association of Urology.
Although he was primarily known for work with genitourinary anatomy, Guyon is credited with the discovery of the ulnar canal at the wrist. This canal tunnels blood vessels and the ulnar nerve from the forearm to the hand, and is now known as Guyon's canal. Ulnar nerve compression at this location is sometimes referred to as Guyon's tunnel syndrome. Another eponymous anatomical term is Guyon's isthmus, an elongated constriction of the junction of the body and cervix.
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