The cochlear duct is a vital part of the inner ear responsible for producing sound signals that are then sent to the brain for interpretation. However, there are several synonyms used when referring to this essential structure. Some of the most commonly used words include the scala media, endolymphatic duct, and ductus cochlearis. The scala media is the most widely used term and is used to define the space between the two spiral membranes that make up the cochlear duct. On the other hand, the endolymphatic duct refers to the small canal that connects the cochlear duct to the endolymph sac, a sac-like structure that regulates the volume of fluid inside the inner ear.