Abstract
The role of the Endolymphatic Duct and Sac is discussed from morphological and experimental evidence of its importance in inner ear fluid circulation. The morphological characteristics of the sac is discussed from animal studies and also in man. It is concluded that the sac acts as a reabsorbtive site for endolymph and that it can also remove high molecular debris from the endolymphatic compartment. It is also concluded that it exhibits immunological properties of great interest. Also a secretory capacity of proteoglycans can be of importance when discussing inner ear pathology and the Meniere's disease.
