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  4. Pharynx and middle ear are interconnected by

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Q. Pharynx and middle ear are interconnected by

Chhattisgarh PMTChhattisgarh PMT 2005

Solution:

Pharynx and middle ear are interconnected by Eustachian canal. Eustachian is made up of elastic cartilage. It maintains equilibrium in and outside of the tympanic membrane.
Blocking of eustachian tube impairs hearing due to imperfect vibrations of drum. Eustachian tube is normally closed, it opnes during swallowing and yawning.