EarExternal ear : Consist of pinna, external auditory canal and tympynic membrane (TM) outer surface. Function : Sound processing by millions of auditory fibers for wide frequency range. Balance by utricle n sacule for lenear Accelaration. Semicircular canals for angular rotational sensation Hearing MechanismHERAING MECHANISM: Hearing is wonderful experience is’nt it . we are hearing various frequency of sounds .the sound travels in air and collected by our pinna to guide it to ear drum . the eardrum sets into vibration which are transmitted to innerear by chains of small bones namely malleus , incus and stapes. This chain is an amplifier of our hearing system as now the sound enters in inner ear fluid which is dense as compare to air. Our inner ear Is filled with fluid called endolymph which is stimulated by stapes movement and thus the wave passed in the inner ear and the point at which the wave fades stimulate the nerve ending at that point and we hear that specific frequency. Our inner ear is called chochlea . It’s a super computer which process the frequency specifically and the arrangement is such that the various frequencies are transmitted to brain, where the information is processed and various system in brain are connected to find the relevance of the information . Let’s see some examples . when we hear sound of horn we sense danger. So our system recognizes it as danger and act accordingly in fraction of seconds we adopt the position which will protect us. So in our brain that sound has to registered previously as danger sound and its stored in memory ,the action to performed in this scenario is learnt by us in past and so we act and protects our self. In above example so many systems were involved involuntarily in fraction of seconds .
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