intrafusal muscle fiber

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intrafusal muscle fiber

[-fyo̅o̅′zəl]
the striated muscle fiber within a muscle spindle.

intrafusal muscle fiber

The structural component of the muscle spindle, made up of small skeletal muscle fibers at either end and a central noncontracile region where the sensory receptors are located.
See also: fiber
References in periodicals archive ?
Each muscle spindle is built around 3-10 small intrafusal muscle fibres attached to the sheaths of the surrounding extrafusal skeletal muscle fibres, the ends of which are excited by small gamma efferent motor nerve fibres.
The receptor portion of the muscle spindle is located midway between its ends where the intrafusal muscle fibres have no contractile element.
Its are composed of 3-12 intrafusal muscle fibers, of which there are three types:
If botulinum toxin is administered over a prolonged period of time, however, true muscle atrophy can occur, both in the extrafusal and intrafusal muscle fibers within the muscle spindle organ.