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Promontory of tympanic cavity
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Promontory of tympanic cavity
The promontory of the tympanic cavity, also known as the cochlear promontory or petrosal promontorium 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 surface of the promontory is furrowed by fine grooves that accommodate to the strands of the tympanic plexus.
The oval window is situated superoposteriorly to the promontory, and the round window inferoposteriorly to it.
A minute spicule of bone frequently connects the promontory to the pyramidal eminence.[citation needed]
In non-mammalian synapsids, the promontorium was not present. During the evolution of mammals, the shrinking and displacement of the basisphenoid allowed for the enlargement of the petrosal, of which the promontorium is a part. This is a major apomorphy by which the earliest mammals can be distinguished from their closest relatives.
This article incorporates text in the public domain from page 1042 of the 20th edition of Gray's Anatomy (1918)
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Promontory of tympanic cavity
The promontory of the tympanic cavity, also known as the cochlear promontory or petrosal promontorium 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 surface of the promontory is furrowed by fine grooves that accommodate to the strands of the tympanic plexus.
The oval window is situated superoposteriorly to the promontory, and the round window inferoposteriorly to it.
A minute spicule of bone frequently connects the promontory to the pyramidal eminence.[citation needed]
In non-mammalian synapsids, the promontorium was not present. During the evolution of mammals, the shrinking and displacement of the basisphenoid allowed for the enlargement of the petrosal, of which the promontorium is a part. This is a major apomorphy by which the earliest mammals can be distinguished from their closest relatives.
This article incorporates text in the public domain from page 1042 of the 20th edition of Gray's Anatomy (1918)
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