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Extrafusal muscle fibers are a class of muscle fiber innervated by alpha motor neurons.
They generate tension, do mechanical work and allow for movement by contracting.
intrafusal muscle fiber - is of sensory type and innervated by gamma motor neurons.
Extrafusal muscle fibers and associated alpha motor neurons are called a
motor unit. The connection between alpha motor neuron and extrafusal muscle fiber is a neuromuscular junction, and the neurotransmitter responsible for contraction is acetylcholine.
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skeletal muscle/general: epimysium, fascicle, perimysium, endomysium, muscle fiber, myofibril
sarcomere (a, i, and h bands; z and m lines), myofilaments ( thin filament/actin, thick filament/myosin, elastic filament/titin), tropomyosin, troponin
neuromuscular junction, intrafusal muscle fiber, extrafusal muscle fiber, motor unit, muscle spindle, sliding filament mechanism
myoblast, satellite cells, sarcoplasm, sarcolemma, sarcoplasmic reticulum, T-tubule
cardiac muscle: myocardium, intercalated disc
smooth muscle: calmodulin, vascular smooth muscle