A myoblast is a type of stem cell that exists in muscles. Skeletal muscle fibers are made when myoblasts fuse together; muscle fibers therefore have multiple nuclei.
Myoblasts that do not form muscle fibers differentiate into satellite cells. These satellite cells remain adjacent to a muscle fiber, separated only by its cell membrane and by the endomysium (the connective tissue investment that divides the muscle fascicles into individual fibers).
See also
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Histology: muscle tissue |
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| skeletal muscle/general |
epimysium, fascicle, perimysium, endomysium, muscle fiber ( intrafusal, extrafusal), myofibril
sarcomere (a, i, and h bands; z and m lines), myofilaments (thin filament/actin, thick filament/myosin, elastic filament/titin, nebulin), tropomyosin, troponin (T, C, I)
costamere (dystrophin, α,β-dystrobrevin, syncoilin, synemin/desmuslin, dysbindin, sarcoglycan, dystroglycan, sarcospan), desmin
neuromuscular junction, motor unit, muscle spindle, excitation-contraction coupling, sliding filament mechanism
myoblast, satellite cell, sarcoplasm, sarcolemma, sarcoplasmic reticulum, T-tubule
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| cardiac muscle |
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| smooth muscle |
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