7. Clinical: Middle Ear- Part 1 Flashcards
(12 cards)
What forms the medial wall of the middle ear?
Promontory (basal turn of cochlea), oval window, round window.
Which muscle is associated with the malleus?
Tensor tympani (pulls malleus medially).
What is the function of the stapedius muscle?
Pulls stapes posteriorly to dampen sound vibrations (stapedial reflex).
Which nerve innervates stapedius muscle?
Facial nerve (CN VII).
What forms the roof of the middle ear?
Tegmen tympani — important for intracranial spread of infection.
What forms the floor of the middle ear?
Jugular bulb — pathway for skull base osteomyelitis.
What is Prussak’s space and its clinical importance?
Space between pars flaccida, neck of malleus, and lateral wall; common site for primary acquired cholesteatoma.
What is the surgical importance of the facial recess?
Landmark for cochlear implant access in intact canal wall mastoidectomy.
Which window connects middle ear to inner ear?
Oval window (occupied by footplate of stapes).
What nerve lies in the fallopian canal in the medial wall?
Facial nerve.
What is the significance of sinus tympani?
Hidden recess; common site for residual cholesteatoma post-surgery.
What is the promontory?
Bulge formed by the first turn of cochlea on the medial wall.
