What is the primary function of the pinna?

• A. Collects sound waves and helps localize sound sources
• B. Transmits vibrations to the inner ear
• C. Converts vibrations into neural signals
• D. Balances pressure in the middle ear

Answer: (A)

The pinna’s main job is to collect sound waves and help us locate where they’re coming from. Its shaped folds and ridges modify the sound in direction-specific ways, creating spectral cues that the brain uses to judge elevation and front–back position in addition to guiding sound into the ear canal.

Other parts of the ear handle the rest: transmitting vibrations to the inner ear is done by the tympanic membrane and the middle-ear bones; turning those vibrations into neural signals happens in the cochlea; and balancing middle-ear pressure is managed by the Eustachian tube.