Myocytes. Coloured transmission electron micrograph (TEM) of a section through early muscle cells. Mitochondria (cyan) and bundles of myofilaments (green) are visible, A large central nucleus is present with rough endoplasmic reticulum and numerous ribosomes present in the cytoplasm. A myocyte is the type of cell found in some types of muscle tissue. Myocytes develop from myoblasts to form muscles in a process known as myogenesis. There are two specialized forms of myocytes with distinct properties: cardiac, and smooth muscle cells.Magnification: x1500 at 10 cm wide