Muscle satellite cells are tiny helpers waiting on the outside of your muscle fibers. When a muscle needs fixing, they wake up and get to work.
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Satellite cells are small, flat cells that sit on the outside of your long muscle fibers. They are tucked under a thin covering that wraps each fiber.
They got their name because they sit at the edge of the fiber, a bit like a satellite next to a planet.
Most of the time they rest quietly. They are stem cells, which means they can make new muscle cells when needed.
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When you exercise hard or hurt a muscle, satellite cells wake up. They split to make more cells.
Some of the new cells join right into the muscle fiber to fix it and help it grow. Others go back to resting, ready for next time.
Grown-up muscle fibers can't split to make more of themselves. That is why satellite cells are so important for fixing muscles!
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