Abstract
The authors observed the cardiac muscular tissue with an electron microscope to try to clarify that the cardiac muscle differs from the skeletal muscle. The cardiac muscular tissue is almost the same as the skeletal muscular tissue, but, it differs in a few points. The cardiac muscular cell has many more mitochondria that the skeletal muscle cell. Myofilaments of cardiac muscular tissue are arranged in the so-called hexagonal double array, and the number of actinfilaments around one myosinfilament seems to be more than six.
