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    Rights: Susumu Nishinaga/Science Photo Library Published 9 October 2012 Size: 810 KB Referencing Hub media

    The utricle and saccule are inner-ear organs that sense gravity and linear movement. It is the presence of small crystals of calcium carbonate called otoliths that allows them to function.
    This is a coloured scanning electron micrograph of crystals of calcium carbonate found in these inner-ear organs.