The tympanic membrane is supplied by the following nerves EXCEPT:

 # The tympanic membrane is supplied by the following nerves EXCEPT :

A. Auriculotemporal

B. Vagus

C. Glossopharyngeal

D. Chorda tympani

The correct answer is D. Chorda tympani.

The tympanic membrane is a thin, translucent partition between external acoustic meatus and the middle ear. It forms an obtuse angle with the floor of the external auditory meatus. It is oval in shape and measures 9*10 mm. It is placed obliquely at an angle of 55 degrees with the floor of the meatus. It faces downwards, forwards and laterally. The inner surface is convex. Its outer surface is concave. The inner surface provides attachment to handle of the malleus which extends upto its center. The point of maximum convexity lies at the tip of the handle of the malleus and is called the umbo. 

The outer surface of the tympanic membrane is supplied by the auriculotemporal nerve and the auricular branch of the vagus. The inner surface is supplied by the glossopharyngeal nerve through the tympanic plexus. 

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