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.
A rounded, hollow outcropping on the medial wall of the middle ear, also referred to as the cochlear bulge, is the most notable characteristic of this region. It is created by the underlying first coil of the cochlea.