The promontory of the tympanic cavity, also known as the cochlear promontory is a rounded hollow prominence upon - and most prominent feature of - the medial wall of the tympanic cavity formed by the underlying first turn of the cochlea.
In the context of the middle ear, the cochlear promontory is a distinctive, rounded hollow outgrowth on the medial wall. It is a notable feature and is created by the underlying first coil of the cochlea.