CROSS STRIATIONS OF THE MUSCLE FIBERS OF THE SINO-AURICULAR NODE
Abstract
A fairly careful search of the literature failed to reveal photomicrographic reproduction of the cross striations of the muscle fibers of the sino-auricular node. These striations have been well described and drawings have been made. In the average section they are often invisible; in some, however, they are visible with the ordinary high power objective. The fibers bear a striking resemblance to the cardiac muscle fibers but are much smaller. They do not have any characteristics of nerve...