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The promontory of the tympanic cavity, also known as the cochlear promontory is a rounded hollow prominence [citation needed] upon - and most prominent feature of - the medial wall of the tympanic cavity formed by the underlying first turn of the cochlea.
The tympanic cavity is bounded by: Facing the inner ear, the medial wall (or labyrinthic wall, labyrinthine wall) is vertical, and has the oval window and round window, the promontory, and the prominence of the facial canal.
The tympanic plexus is a nerve plexus within the tympanic cavity formed upon the promontory of tympanic cavity by the tympanic nerve (branch of the inferior ganglion of glossopharyngeal nerve (CN IX)), and the superior and inferior caroticotympanic nerves (post-ganglionic sympathetic branches of the internal carotid plexus).
The round window is situated below (inferior to) and a little behind (posterior to) the oval window, from which it is separated by a rounded elevation, the promontory.. It is located at the bottom of a funnel-shaped depression (the round window niche) and, in the macerated bone, opens into the cochlea of the internal ear; in the fresh state it is closed by a membrane, the secondary tympanic ...
It passes through the petrous part of the temporal bone within the tympanic canaliculus that is situated within the bony ridge separating the carotid canal and the jugular foramen to reach the middle ear. [2] In the tympanic cavity of the middle ear, it ramifies upon the promontory of tympanic cavity to form the tympanic plexus. [2] [1 ...
When the stapes presses on the oval window, it causes the perilymph, the liquid of the inner ear to move. The middle ear thus serves to convert the energy from sound pressure waves to a force upon the perilymph of the inner ear. The oval window has only approximately 1/18 the area of the tympanic membrane and thus produces a higher pressure ...
In about 10% of cases of otosclerosis, there is a redness of the promontory of the cochlea seen through the tympanic membrane due to prominent vascularity associated with an otospongiotic focus. [2] Be aware of the similar, Brown's sign. This is a red retro-tympanic bulge that blanches on pressure via pneumatic otoscopy.
In its lateral or tympanic wall is the oval window, closed, in the fresh state, by the base of the stapes and annular ligament.