part_of part of part of develops from develops from starts during anatomical entity muscle cell myoblast myocyte muscle fiber CL:0000187 muscle cells XAO:0004475 A mature contractile cell, which has as part of its cytoplasm myofibrils organized in various patterns. Found in muscle tissue, myocytes are long, tubular cells that arise developmentally from myoblasts to form muscle. There are specialized forms: cardiac, skeletal, and smooth muscle myocytes, with various properties. eriksegerdell xenopus_anatomy muscle cell myocytes 2013-03-17T12:20:58Z NF stage 27