De aquaeductibus auris humanae intemae.

Cotugno is sometimes accredited with the discovery of the “liquor Cotunnii”, the labyrinthine fluid, first noted by Pyl in 1742. He did, however, make important contributions to the knowledge on the structure and function of the ear, including the discovery of the aural aqueducts. The naso-palatine nerve and the columns in the osseous spiral lamina are named after him.