are muscle fibres that are empirical to the general running and functioning of the nervous system. These fibres coat muscle spindles and are one of the primary 'driving forces' behind muscle contraction.

EXTRAFUSAL FIBER: "The process of muscle contraction, like most parts of the nervous system rely on fibres, in this case extrafusal fibres."
Cite this page: N., Pam M.S., "EXTRAFUSAL FIBER," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/extrafusal-fiber/ (accessed April 11, 2021).