Extrafusal muscle fiber

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Extrafusal muscle fibers are a class of muscle fiber innervated by alpha motor neurons. Contraction of these fibers generates mechanical work and allows for movement. 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.

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Histology: muscle tissue

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 (T, C, I)

neuromuscular junction, intrafusal muscle fiber, extrafusal muscle fiber, motor unit, muscle spindle, sliding filament mechanism

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smooth muscle: calmodulin, vascular smooth muscle

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