THE STRUCTURE OF THE SARCOLEMMA OF THE FROG SKELETAL MUSCLE FIBER

The classical paper of Bowman (1) 1 provides an excellent description of the delicate tubular structure which invests each striated muscle fiber, and is especially replete with elaborate sketches of various muscle fibers from a comparative point of view. Subsequently many papers have been published using the light microscope in conjunction with various histological techniques. In recent years both replica and sectioning methods have provided electron micrographic evidence which has further elucidated the ultrastructure of this region of the fiber. In this brief report we shall at tempt to present both light and electron micrographs of the frog muscle fiber so as to bring together in one paper the various levels of observation with regard to the structure of this region which is of interest to both cytologists and physiologists.