The Prussak's space (superior recess of the tympanic membrane) is bounded superiorly by Shrapnell's membrane. Which of the following is its medial boundary?
- A Lateral surface of the malleus neck ✓
- B Lateral surface of the body of the incus
- C Anterior wall of the middle ear (tensor tympani canal)
- D Medial wall of the middle ear (lateral semicircular canal prominence)
Correct answer: A. Lateral surface of the malleus neck
Explanation
Prussak's space is the key anatomical location for attic (pars flaccida) cholesteatoma formation. Its boundaries are: superiorly — the lateral malleal ligament (Shrapnell's membrane/pars flaccida); inferiorly — the lateral process of the malleus; medially — the neck of the malleus; laterally — the pars flaccida (Shrapnell's membrane). Understanding these boundaries is critical for surgical planning, as cholesteatoma originating here tends to spread posteriorly into the epitympanum and mastoid.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.