The inner membrane of mitochondria comprises several folds that produce a layered structure called[[1]].

The inner membrane of the mitochondrion is composed of multiple folds or crests, which are known as cristae. The cristae increase the surface area of the inner membrane, providing a larger space for the electron transport chain enzymes and ATP synthase to carry out cellular respiration and produce ATP. This unique feature of the mitochondrial inner membrane enables the efficient production of energy by the cell.