intrafusal fibres

intrafusal fibres

the muscle fibres within a MUSCLE SPINDLE.

intrafusal fibres

muscle fibres within a muscle spindle ('intrafusal': Latin, within spindle ), invested with afferent ('sensory') nerve endings and located so as to detect length changes in the main working (extrafusal) fibres of the muscle. See also gamma (motor) system, motor neurons.
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Gamma [chi] motorneurons, which transmit impulses to special skeletal muscle fibres, called intrafusal fibres, part of the muscle spindle.
Muscle energy technique (MET)

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