Image Based Question-66192

Area as marked by an arrow is ?

A. Shrapnell’s membrane.

B. Annulus tympanicus.

C. Pars tensa.

D. Posterior malleal fold.

Show Answer

Correct Answer » C Explanation

Ans:C. Pars tensa.

The image is shown of a Tympanic membrane.

Tympanic membrane

• Structure:

1. Outer epithelial/cutaneous layer: stratified squamous epithelium .
2. Middle fibrous layer: thin/absent in pars flaccida; contains 3 types of fibers – radial,
3. circular and parabolic.
4. Inner mucosal layer

Components:

• Anterior and posterior malleolar fold: Converges to the lateral process of malleus from 2 ends of the tympanic notch of Rivinus.

• Pars flacidda/Sharpnell membrane/Rivinus membrane: Part of relatively lax membrane lying above the malleolar folds; lack middle fibrous layer

• Pars tensa: Relatively taut and forms the remaining part of the tympanic membrane; contain all 3 layers.

• Annulus tympanicus: Thick rolled periphery of pars tensa.

• Umbo: Center of the tympanic membrane which divides it into 4 quadrants and the point of attachment for the handle of malleus.

• Tympanic notch of Rivinus/Rivinus incisure: Notch (deficient area) in the superior part of fibrocartilaginous tympanic ring bridged by pars flaccida.

• Cone of light/Light reflex: In the antero-inferior quandrant, below and anterior to the handle of malleus.