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Embryology and Anatomy of Ear

Question
29 out of 70
 

Promontory seen in the middle ear is:



A Jugular bulge
B Basal turn of cochlea

C SemiCIrcular canal
D Head of incus

Ans. B Basal turn of cochlea Ref. Dhingra 6th/ed p5, 5th/ed p 6

Promontory is seen in the medial wall of middle ear and is due to basal coil of cochlea.

Also Know

Medial wall of middle ear is formed by labyrinth.

The main features on medial wall are:

A bulge called as promontory formed by basal turn of cochlea.

Fenestra vestibuli (oval windowQ) lies posterosuperior to the promontory and opens into scala vestibuli. It is occupied by foot- plate of stapes which is fixed by annular ligament. Oval window is kidney-shaped

Fenestra cochleae (round window) lies posteroinferior, to the promontory and opens into scala tympani of cochlea. It is closed be secondary tympanic membrane. The round window is closest to ampulla of posterior semicircular canal.

Prominence of facial nerve canal lies above the fenestra vestibuli curving downward into posterior wall of middle ear.

Anterior to oval window lies a hook-like projection called the processus cochleariformis? for tendon of tensor tympani".

The cochleariform process marks the level of the Genu of the facial nerve which is an im~rtant landmark for surgery of the facial nerve.

Medial to the pyramid is a deep recess called sinus tympaniQ which is bounded by the subiculum below and ponticus above.

Embryology and Anatomy of Ear Flashcard List

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