Corporate headquarters for your DNA is the nucleus. At the same time, multiple branch offices reside scattered around that part of the cell out side of the nucleus called the "cytoplasm". These branch offices are called "mitochondria" and contain a much smaller, circular shaped DNA passed down from the moms of the world. You have come to call this mtDNA [ for this unique form of circular DNA located in the branch offices]. A big picture of this single cell organization is shown.