The correct order of structures as you move from the outside a muscle cell to deep inside is, Fiber, Myofibril, Myofilament.
Myocytes, also known as muscle cells, are the cells that comprise muscular tissue. There are three types of muscle cells in the human body: cardiac, skeletal, and smooth.
Skeletal muscle cells are multi-nucleated, long, cylindrical, and striated. Each nucleus is in charge of the metabolic requirements of the sarcoplasm that surrounds it. Skeletal muscle cells require a lot of energy, so they have a lot of mitochondria to make enough ATP.
Sarcoplasm is composed of myofibrils that are composed of thick and thin myofilaments.
Cardiomyocytes have a small, thin, rectangular shape. They have a single nucleus, cell organelles similar to skeletal muscle cells, and a large number of sarcosomes that provide energy for contraction. Intercalated discs, which have gap junctions for diffusion and communication, connect cardiomyocytes structurally.
Smooth muscle cells are striated, spindly in shape, and have a single nucleus in the center. Smooth muscle cells are stacked in sheets, allowing them to contract at the same time. They have poorly formed sarcoplasmic reticulum's and no T-tubules due to their small size.
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