A) tympanic canal
B) eustachian canal
C) cochlear canal
D) vestibular canal
Correct Answer: B
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.
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