Low frequency sounds are detected in the ear by the hair cells located in the cochlea, specifically in the apex or helicotrema region. These hair cells are responsible for converting sound vibrations into electrical signals that are then transmitted to the brain via the auditory nerve.
The organ of Corti, which is located within the cochlea, picks up vibrations of fluid and converts them into electrical signals that are transmitted to the brain via the auditory nerve. This process is essential for the perception of sound.