Ear and hearing
Category C - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The version with watermark is for free to embed. Hearing is a very complex process. The pinna collects sound pressure waves and directs them like a funnel into the ear canal. The eardrum transmits the oscillations to the ear bones. These smallest bones of the body amplify the sound up to 40 times and transfer it to the oval window and the cochlea. The cochlea is filled with water which transmits sound much better than air. The water waves stimulate 10thousands of minute hairs that move with a frequency of about 20.000 per second. These so called hair cells, which are tuned to the single pitches, convert the mechanical waves into electrical impulses. The fibers of the auditory nerve transmit the signals to the brain. There the acoustical stimuli are decoded and understood.