Their cells are organized into tracts that form nerve-like endings, even though they are not nerves.  Their cells are long and barrel-shaped, with a few myofibrils surrounding a clear core of sarcoplasm, and their central region is rich in glycogen. They form gap junctions, 
Their cells are organized into tracts that form nerve-like endings, even though they are not nerves.  Their cells are long and barrel-shaped, with a few myofibrils surrounding a clear core of sarcoplasm, and their central region is rich in glycogen. They form gap junctions, fasciae adherents, and desmosomes with surrounding cells, but not through intercalated disks. Ventricular depolarization is mainly dependent on them, and they extend down the interventricular septum, penetrate the heart apex, and spread up the lateral ventricle walls. Located in the bundle of His, FTP, identify these tendrils of modified cardiac cells that generate the electrical stimulus for cardiac contractions.  3
Their cells are organized into tracts that form nerve-like endings, even though they are not nerves.  
Purkinje fibers