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Qué (quién) es muscle fiber - definición
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![A chicken embryo, showing the [[paraxial mesoderm]] on both sides of the neural fold. The anterior (forward) portion has begun to form [[somite]]s (labeled "primitive segments").](https://commons.wikimedia.org/wiki/Special:FilePath/Gray18.png?width=200 "A chicken embryo, showing the [[paraxial mesoderm]] on both sides of the neural fold. The anterior (forward) portion has begun to form [[somite]]s (labeled \"primitive segments\").")
Wikipedia
A muscle cell is also known as a myocyte when referring to either a cardiac muscle cell (cardiomyocyte), or a smooth muscle cell as these are both small cells. A skeletal muscle cell is long and threadlike with many nuclei and is called a muscle fiber. Muscle cells (including myocytes and muscle fibers) develop from embryonic precursor cells called myoblasts.
Myoblasts fuse form multinucleated skeletal muscle cells known as syncytia in a process known as myogenesis. Skeletal muscle cells and cardiac muscle cells both contain myofibrils and sarcomeres and form a striated muscle tissue.
Cardiac muscle cells form the cardiac muscle in the walls of the heart chambers, and have a single central nucleus. Cardiac muscle cells are joined to neighboring cells by intercalated discs, and when joined in a visible unit they are described as a cardiac muscle fiber.
Smooth muscle cells control involuntary movements such as the peristalsis contractions in the esophagus and stomach. Smooth muscle has no myofibrils or sarcomeres and is therefore non-striated. Smooth muscle cells have a single nucleus.
