What is the ear canal?

• A. A bone in the middle ear
• B. The inner ear's vestibule
• C. The part that connects the ear to the brain
• D. A tube running from the outer ear to the middle ear

Answer: (D)

The ear canal is the tube that carries sound from the outside of the head to the eardrum. It’s part of the outer ear, not a bone or a structure of the inner ear. This channel runs from the opening of the ear to the tympanic membrane in the middle ear, helping to funnel and protect sound as it reaches the eardrum. It’s lined with skin and contains glands that produce earwax, which helps guard the ear. The other descriptions aren’t accurate: a bone in the middle ear refers to the tiny ossicles, the inner-ear vestibule is involved in balance, and there isn't a canal that connects the ear directly to the brain—the neural connection is via the auditory pathway after the eardrum and ossicles.