Pinna collects and direct sound wave along auditiory canal to ear drum ear drum converts sound wave into mechanical vibrations vir，bration is amplified c，and conducted along ear bone to oval window perilympth in upper canal and endolympth in central canal is set into vibrations endolypt，mpth movement stimulate sensory hair cells to generate nerve impulse which transmit along auditory nr，erve to cerebrum auditory centre of cerebrum interprets nerve impulse to give sensation of hearing
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