Cristae are
evaginations of inner membrane of mitochondria extended into the intermembrane space.
invaginations of inner membrane of mitochondria extended into the matrix of mitochondrion.
evaginations of outer membrane mitochondria extended into the cytosol
invaginations of outer membrane of mitochondrion extended into the intermembrane space.
Cristae are invaginations of inner membrane of mitochondria extended into the matrix of mitochondrion.