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Embryology and Anatomy of Ear

Question
18 out of 70
 

In otoscopy, the most reliable sign is:



A Lateral process of malleus

B Handle of malleus

C Umbo

D Cone of light

Ans. A Lateral process of malleus Ref. Maqbool 7 th/ed p 33

Otoscopy

Helps to view the inside of external auditory canal.

For proper view: Pinna is pulled

o Backward and upward in adults."

o Downward and outward in infants?

The tympanic membrane appears as a grayish white, translucent membrane set obliquely inside the canal.

The important landmarks on membrane are:

Landmark

Importance

o The short process. (Lateral process of malleus)

o Anterior and posterior malleolar folds

o Handle of malleus: It is directed downward and backward; ending at the umbo

It is the most important landmark as it is least obliterated in disease

Separates pars tensa from pars flaccida

Cone of light radiates from it. Pars tensa is arbitrarily divided into four

quadrants by a vertical line passing along the handle of malleus and

horizontal line intersecting it at umbo

Since, short process/lateral process of malleus is least obliterated by diseases so I think it IS the most reliable sign In otoscopy.

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