muscle cell NIFSTD:sao519252327 Tomasz Adamusiak A mature contractile cell, commonly known as a myocyte, that forms one of three kinds of muscle. A mature contractile cell, commonly known as a myocyte, that forms one of three kinds of muscle. This cell has as part of its cytoplasm myofibrils organized in various patterns. Mature contractile cells, commonly known as myocytes, that form one of three kinds of muscle. The three types of muscle cells are skeletal (muscle fibers), cardiac (myocytes, cardiac), and smooth (myocytes, smooth muscle). They are derived from embryonic (precursor) muscle cells called myoblasts (MSH). NCIt:C12612 James Malone cell type