Ear-tympanic Membrane

Question 1

Dimensions of tympanic membrane

Answer 1

Diameter – 9 to 10 mm
Area – 90 mm²
Thickness – 0.1 mm

Question 2

What is annulus

Answer 2

Peripheral thickened part of the tympanic membrane

Question 3

What is seigellisation

Answer 3

Putting air pressure in ear using Siegel speculum

Question 4

4 landmarks of Tympanic membrane

Answer 4

Handle of malleus
Umbo
Lateral process of malleus
Cone of light

Question 5

What is cone of light

Answer 5

It is the reflection of light from handle of malleus

Question 6

How to find the direction of Tympanic membrane using cone of light
Eg.Which ear is it if the cone of light is at 5 o’clock position

Answer 6

Right ear

Question 7

At what angle is the tympanic membrane aligned

Answer 7

55° horizontal

It’s postero-superior part is more lateral on the anterio- inferior part

Question 8

What is the effective area of the tympanic membrane

Answer 8

45 mm²

Peripheral part is more mobile than central part

Question 9

What are the two parts of the tympanic membrane

Answer 9

Pars tense and pars flaccida

Question 10

Three layers of pars tensa

Answer 10

Outer skin
Inner mucosa
Middle fibrous layer

Question 11

Pars flaccida aka

Answer 11

Sharpnell’s membrane

Question 12

Layers of pars flaccida

Answer 12

Outer skin and inner mucosa present
Almost Absence of middle fibrous layer
Therefore weak

Question 13

Nerve supply of Tympanic membrane

Answer 13

Outer surface (same as EAC)
Inner surface (same as middle ear)

Check if you don’t know 🙈🙈