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However, once a crystal becomes lodged in the cupula, it only takes slight head movements in combination with gravity, to create an action potential, which signals to the brain that the head is moving through space, when in reality, it is not, thus creating the experience of vertigo associated with BPPV.
Drawing of the statocyst system Statocysts (ss) and statolith (sl) inside the head of sea snail Gigantopelta chessoia. The statocyst is a balance sensory receptor present in some aquatic invertebrates, including bivalves, [1] cnidarians, [2] ctenophorans, [3] echinoderms, [4] cephalopods, [5] [6] crustaceans, [7] and gastropods, [8] A similar structure is also found in Xenoturbella. [9]
Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals. Adherents of the practice claim that these have healing ...
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The calcium carbonate that the otolith is composed of is primarily derived from the water. As the otolith grows, new calcium carbonate crystals form. As with any crystal structure, lattice vacancies will exist during crystal formation allowing trace elements from the water to bind with the otolith.
Embedded in this membrane are calcium carbonate crystals, called otoconia, or "ear rocks." As the head is tilted forward or backward, the otoconia move the hair cells in a similar fashion to the semicircular canal fluid movement and cause depolarization of the hair cells.
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