Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors). They detect the amount and rate of change in length of a muscle. They constitute the muscle spindle, and are innervated by both sensory (afferent) and motor (efferent) fibers. Intrafusal muscle fibers are not to be confused with extrafusal muscle fibers, which contract, generating skeletal movement and are innervated by alpha motor neurons.
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| - Intrafusal muscle fiber (en)
- Fibra muscular intrafusal (pt)
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| - Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors). They detect the amount and rate of change in length of a muscle. They constitute the muscle spindle, and are innervated by both sensory (afferent) and motor (efferent) fibers. Intrafusal muscle fibers are not to be confused with extrafusal muscle fibers, which contract, generating skeletal movement and are innervated by alpha motor neurons. (en)
- Fibras intrafusais são fibras musculares localizadas no interior do fuso muscular, cuja função é gerar sinais para o controle muscular. Recebem este nome para diferenciá-las das fibras extrafusais, que são todas as fibras musculares geradoras de força, que se encontram fora do fuso. As fibras intrafusais são inervadas por motoneurônios gama, enquanto as fibras extrafusais são inervadas por motoneurônios alfa. (pt)
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| - Intrafusal muscle fiber (en)
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| - A muscle spindle, with γ motor and Ia sensory fibers (en)
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| - Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors). They detect the amount and rate of change in length of a muscle. They constitute the muscle spindle, and are innervated by both sensory (afferent) and motor (efferent) fibers. Intrafusal muscle fibers are not to be confused with extrafusal muscle fibers, which contract, generating skeletal movement and are innervated by alpha motor neurons. (en)
- Fibras intrafusais são fibras musculares localizadas no interior do fuso muscular, cuja função é gerar sinais para o controle muscular. Recebem este nome para diferenciá-las das fibras extrafusais, que são todas as fibras musculares geradoras de força, que se encontram fora do fuso. As fibras intrafusais são inervadas por motoneurônios gama, enquanto as fibras extrafusais são inervadas por motoneurônios alfa. É pelas informações obtidas das fibras intrafusais pelas fibras sensoriais Ia e II, e transmitidas para o sistema nervoso central, que um indivíduo é capaz de julgar a posição de seu músculo e a velocidade com que ele está mudando. (pt)
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| - myofibra intrafusalis (en)
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