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From Citizendium, the Citizens' Compendium

Cristae, in anatomy, are crests or ridges projecting from a surface, as in the dermal ridges on palms and soles. In cells, it is the infolding or inward projections of the inner membrane of the mitochondrion, which are studded with proteins and increase the surface area for chemical reactions to occur like cellular respiration. It can also be the sensory epithelium of the vestibular system located within the inner ear.^[1]

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