Which structure connects the middle ear to the pharynx?

Which structure connects the middle ear to the pharynx?

• A. Cochlea
• B. Eustachian tube
• C. Semicircular canal
• D. Tympanic membrane

Answer: (B)

The key concept is how the middle ear maintains air pressure and drains into the throat. The structure that connects the middle ear to the pharynx is the Eustachian tube. It links the middle ear cavity to the nasopharynx, and it normally stays closed but opens briefly during swallowing, yawning, or chewing. This opening allows air to flow between the middle ear and the throat, equalizing pressure on both sides of the eardrum and helping drainage. When it functions properly, hearing stays clear and comfortable; when it doesn’t, you might notice a sense of fullness, muffled hearing, or ear pain, and fluid can accumulate. By contrast, the cochlea is part of the inner ear that converts sound vibrations into neural signals, the semicircular canals are involved in balance and motion detection, and the tympanic membrane (eardrum) is the membrane that vibrates in response to sound but does not connect to the pharynx.

The key concept is how the middle ear maintains air pressure and drains into the throat. The structure that connects the middle ear to the pharynx is the Eustachian tube. It links the middle ear cavity to the nasopharynx, and it normally stays closed but opens briefly during swallowing, yawning, or chewing. This opening allows air to flow between the middle ear and the throat, equalizing pressure on both sides of the eardrum and helping drainage. When it functions properly, hearing stays clear and comfortable; when it doesn’t, you might notice a sense of fullness, muffled hearing, or ear pain, and fluid can accumulate.

By contrast, the cochlea is part of the inner ear that converts sound vibrations into neural signals, the semicircular canals are involved in balance and motion detection, and the tympanic membrane (eardrum) is the membrane that vibrates in response to sound but does not connect to the pharynx.