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Alpha (α) motor neurons (also called alpha motoneurons), are large, multipolar lower motor neurons of the brainstem and spinal cord. They innervate extrafusal muscle fibers of skeletal muscle and are directly responsible for initiating their contraction. Alpha motor neurons are distinct from gamma motor neurons, which innervate intrafusal muscle fibers of muscle spindles. An alpha motor neuron and the muscle fibers it innervates is a motor unit. A motor neuron pool contains the cell bodies of all the alpha motor neurons involved in contracting a single muscle.

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  • Alpha motor neuron
  • Альфа-мотонейрон
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  • Alpha (α) motor neurons (also called alpha motoneurons), are large, multipolar lower motor neurons of the brainstem and spinal cord. They innervate extrafusal muscle fibers of skeletal muscle and are directly responsible for initiating their contraction. Alpha motor neurons are distinct from gamma motor neurons, which innervate intrafusal muscle fibers of muscle spindles. An alpha motor neuron and the muscle fibers it innervates is a motor unit. A motor neuron pool contains the cell bodies of all the alpha motor neurons involved in contracting a single muscle.
  • Альфа-мотонейроны (α-мотонейроны) — большие, мультиполярные нижние мотонейроны ствола мозга и спинного мозга. Они иннервируют экстрафузальные мышечные волокна скелетных мышц и напрямую ответственны за инициализацию их сокращения. Альфа-мотонейроны отличаются от гамма-мотонейронов, которые иннервируют интрафузальные мышечные волокна мышечных веретен. Альфа-мотонейрон и мышечные волокна, которые он иннервирует, образуют моторную единицу. Пул мотонейронов объединяет все мотонейроны, иннервирующие одну мышцу.
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