Pyramidal eminence

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Pyramidal eminence

The medial wall and part of the posterior and anterior walls of the right tympanic cavity, lateral view. (Pyramidal eminence labeled at left, second from bottom.)

Details
Identifiers
Latin| eminentia pyramidalis
TA98| A15.3.02.024
TA2| 6913
FMA| 77732
Anatomical terminology

[edit on Wikidata]

The pyramidal eminence is a hollow conical projection upon the posterior wall of the tympanic cavity of the middle ear. The stapedius muscle arises in the hollow of the eminence and its tendon exits through its apex.[1]

The pyramidal eminence is situated inferior to the aditus to mastoid antrum,[1] immediately inferior to the oval window (fenestra vestibuli), and anterior to the vertical portion of the facial canal. The apex of the eminence is directed anteriorly toward the oval window.[citation needed]

The cavity in the pyramidal eminence is prolonged inferoposteriorly anterior to the facial canal, with which it communicates by a minute aperture which transmits the nerve to the stapedius from the facial nerve (CN VII).[citation needed]

The space lateral to the pyramidal eminence is the facial recess, which is accessed during surgery for cochlear implant. The space medial to the pyramidal eminence is the sinus tympani.

## References

[edit]

1. ^ a b Sinnatamby, Chummy S. (2011). Last's Anatomy (12th ed.). Elsevier Australia. ISBN 978-0-7295-3752-0.

This article incorporates text in the public domain from page 1042 of the 20th edition of Gray's Anatomy (1918)

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Anatomy of hearing and balance

Outer ear|

* Auricle
* helix
* antihelix
* tragus
* antitragus
* intertragic notch
* earlobe
* Ear canal
* Auricular muscles
* Eardrum
* umbo
* pars flaccida

Middle ear|

| Tympanic cavity|

* Medial structures
* oval window
* round window
* secondary tympanic membrane
* prominence of facial canal
* promontory of tympanic cavity
* Posterior structures
* mastoid cells
* aditus to mastoid antrum
* pyramidal eminence

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Ossicles|

* Malleus
* superior ligament
* lateral ligament
* anterior ligament
* Incus
* superior ligament
* posterior ligament
* Stapes
* annular ligament
* Muscles
* stapedius
* tensor tympani

Auditory tube /
Eustachian tube|

* Torus tubarius

Inner ear|

| Labyrinths|

* membranous
* bony

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Auditory system|

| General|

* Cochlea
* Vestibular duct
* Helicotrema
* Tympanic duct
* Modiolus
* Cochlear cupula
* Perilymphatic space
* Perilymph
* Cochlear aqueduct
* Cells
* Claudius
* Boettcher

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Cochlear duct /
scala media|

* Reissner's/vestibular membrane
* Basilar membrane
* Reticular membrane

* Endolymph
* Stria vascularis
* Spiral ligament

* Organ of Corti
* stereocilia
* tip links
* Tectorial membrane
* Sulcus spiralis
* externus
* internus
* Spiral limbus

Vestibular system|

| Vestibule|

* Utricle
* macula
* Saccule
* macula
* Kinocilium
* Otolith
* Otolithic membrane
* Vestibular aqueduct
* endolymphatic duct
* endolymphatic sac
* Ductus reuniens

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Semicircular canals|

* Superior
* Posterior
* Horizontal
* Ampullary cupula
* Ampullae
* crista ampullaris

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