In this higher-power image the transverse striations of the cells marking the limits of the sarcomeres are only faintly visible. The striations of cardiac muscle arise in the same way as those of skeletal muscle, but they aren't as evident in most LM preparations because of the size difference in the cells. In this image, though, the intercalated discs can be seen as darkened transverse markings. A few of the many ID's in this field are indicated by small arrows. Within a myocyte, ID is the site of anchorage of the first and last Z-line of each sarcomere in a given myofibril.
Some blood vessels are evident in among the cells.