Abstract
The author emphasizes especially the intracellular organization of the vertebrate skeletal muscle cell. Whenever possible, chemical components and their metabolism are related to morphology and function. The contents includes such structures as granular components of muscle cytoplasm, nucleus, sarco-plasm, sarcolemma, and myofibril; such substances as myosin, actin, tropomyosin, actomyosin, myosin, adenosinetriphosphatase, and nucleo-tides; and such states as contraction, relaxation, fatigue, and rigor mortis .