Definition: A cytosome is a vesicle-like structure in eukaryotic cells that contains two major components, the nucleus and the mitochondria. The cytoskeleton of the cytosol, which is composed of microtubules and other actin filaments, helps to maintain the shape and stability of the cytosolic components. The term "cytoplasm" refers to the intercellular space between the cytosol and the surrounding cell membrane. This space contains a variety of