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The human ear consists of three parts the outer ear, middle ear and inner ear. The ear canal of the outer ear is separated from the air filled tympanic cavity of the middle ear by the eardrum. The middle ear contains the three small bones the ossicles involved in the transmission of sound, and is connected to the throat at the nasopharynx, via the pharyngeal opening of the Eustachian tube. The inner ear contains the otolith organs the utricle and saccule and the semicircular canals belonging to the vestibular system, as well as the cochlea of the auditory system.