Medical Definition of crista
1: one of the areas of specialized sensory epithelium in the ampullae of the semicircular canals of the ear serving as end organs for the vestibular sense—called also crista ampullaris
2: a membranous spiral fold running the length of the body of certain spirochetes
3: an elevation of the surface of a bone for the attachment of a muscle or tendon
4: any of the inwardly projecting folds of the inner membrane of a mitochondrion
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