Mitochondria are the centers for oxidative phosphorylation. These organelles occur ubiquitously in the neuron and its processes (Figs. 1-4 and 1-6). Their overall shape may change from one type of neuron to another, but their basic morphology is identical to that in other cell types. Mitochondria consist morphologically of double-membraned sacs surrounded by protuberances, or cristae, extending from the inner membrane into the matrix space [7].