define Pinna , auditory canal , ear drum
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The outer ear consists of the visible portion on the side of the head, known as the pinna [1], and the external auditory canal (ear canal) [2]. The purpose of the pinna is to catch sound waves, amplify them slightly, and funnel them down the ear canal to the tympanic membrane (eardrum) [3].
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pinna-the pinna the only visible part of ear(the auricle)with its special helical shape .it is the first part of the ear which reacts to sound .the function of pinna is to act as a kind of funnel which assets in directing the sound further into the ear.
auditory cannal:-the ear cannal(external acoustic meatus, auditory meatus ,EAM)is the pathway running from a outer ear to middle ear .the adult human ear canal extends from pinna to the ear drum and is about 2.5cm
ear drum :- ear drum is the important part of your ear. sound waves travel through your ear canal to reach the ear drum .the ear drum is a thin scalp of skin that is stretched tight like a drum and vibrates when sound its it.
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