The apex of the cochlea is primarily responsive to which type of sounds?

The apex of the cochlea is primarily responsive to low frequency sounds due to the anatomical structure and characteristics of the cochlea. The cochlea is a spiral-shaped organ with varying width and stiffness along its length; this variation causes different frequencies of sound to be processed at different locations.

Low frequency sounds, which have longer wavelengths, resonate more effectively at the apex where the basilar membrane is wider and less stiff. This is in contrast to the base of the cochlea, which is narrower and stiffer, allowing it to respond optimally to high frequency sounds. Understanding this organization is crucial for interpreting how sound frequencies are perceived by the auditory system and is foundational in audiology and hearing aid dispensing practices.