Abstract
The contribution of muscle spindles to the control of locomotion depends on the patterns of discharge that occur in static and dynamic gamma motoneurones (ysand yo). Discharges of y-axons to the MG muscle were studied during treadmill locomotion in pre-mammillary, decerebrated cats. All ys-efferents increased their rate of discharge at onset of locomotion and were modulated with movement. Type-1 increased their rate with muscle shortening whereas type-2 ysefferents increased their discharge rate during muscle lengthening. The type-1 yspattern appears to be a temporal template of the intended movement. The type-2 yspattern may be appropriate for afferent biasing through bag2intrafusal fibres. TheYoaxons showed an interrupted discharge pattern with sudden onset of firing at the start of muscle shortening and falling quiet shortly after the beginning of lengthening. The yodischarge would prepare primary endings to respond with high sensitivity at the start of muscle lengthening.
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References
Appenteng, K., Morimoto, T., and Taylor, A., 1980, Fusimotor activity in masseter nerve of the cat during reflex movementsJournal of Physiology305, 415–431.
Bessou, P., Dupui, J. M., Cabelguen, M., Joffroy, M., Montoya, R., and Pages, B., 1990, Discharge patterns of y-motoneurones of extensor and flexor hindlimb muscles during walking in the thalamic catProgress in Brain Research80, 37–45.
Celichowski, J., Emonet-Denand, F., Laporte, Y., and Petit, J., 1994, Distribution of static y-axons in cat peronius tertius spindles determined by exclusively physiological criteriaJournal of Neurophysiology71, 722–732.
Durbaba, R., Taylor, A., Ellaway, P. H., and Rawlinson S., 2000, The importance of the timing of dynamic gamma discharge for its effects on the primary muscle spindle afferent response to stretchJournal of Physiology527, 136–137P.
Ellaway, P. H., Davey N. J., and Ljubisavljevic, M., 1997, Organization of the sural cutaneous input regulating the discharge of triceps surae y-motoneurones in the catExperimental Physiology82, 121–138.
Ellaway, P. H., and Murphy, P. R., 1980, Autogenetic effects of muscle contraction on extensor gamma motoneurones in the catExperimental Brain Research38, 305–312.
Gladden, M. H., 1981, The activity of intrafusal muscle fibres during central stimulation in the cat, in:Muscle Receptors and MovementA. Taylor, and A. Prochazka, eds., Macmillan, London, pp. 109–122.
Johansson, H., and Sojka, P., 1985, Actions on gamma motoneurones elicited by electrical stimulation of cutaneous afferent fibres in the hindlimb of the catJournal of Physiology366, 343–364.
Lund, J. P., Smith, A. M., Sessle, B. J., and Murakami, T., 1979, Activity of trigeminal alpha and gamma motoneurones and muscle afferents during performance of a biting taskJournal of Neurophysiology42, 710–725.
Murphy, P. R., and Hammond, G. R., 1991, The role of cutaneous afferents in the control of y-motoneurones during locomotion in the decerebrate catJournal of Physiology434, 529–547.
Murphy, P. R., Stein, R.B., and Taylor, J., 1984, Phasic and tonic modulation of impulse rates in y-motoneurones during locomotion in premammillary catsJournal of Neurophysiology52, 228–243.
Prochazka, A., 1996, Proprioceptive feedback and movement regulation, in:Handbook of Physiology. Exercise: Regulation and integration of multiple systemsL B. Rowell, and J. T. Sheperd, eds., American Physiological Society, New York, pp. 89–127.
Prochazka, A., and Gorassini, M., 1998, Ensemble firing of muscle afferents recorded during normal locomotion in catsJournal of Physiology507, 293–304.
Prochazka, A., Hulliger, M., Zangger, P., and Appenteng, K., 1985, “Fusimotor set”: new evidence for y-independent control of y-motoneurones during movement in the awake catBrain Research339, 136–140.
Prochazka, A., Westerman, R., and Ziccone, S. P., 1976, Discharges of single hindlimb afferents in the freely moving catJournal of Neurophysiology39, 1090–1104.
Stein, R. B., MisiaszekJ.E., and Pearson, K. G., 2000, Functional role of muscle reflexes for force generation in the decerebrate walking catJournal of Physiology525, 781–791.
Taylor, A., Durbaba, R., Ellaway, P. H., and Rawlinson, S., 2000a, Patterns of fusimotor activity during locomotion in the decerebrate cat deduced from recordings from hindlimb muscle spindlesJournal of Physiology522, 515–532.
Taylor, A., Ellaway, P. H., and Durbaba, R., 1998, Physiological signs of the activation of bags and chain intrafusal muscle fibers of gastrocnemius muscle spindles in the catJournal of Neurophysiology80, 130–142.
Taylor, A., Ellaway, P. H., Durbaba, R., and Rawlinson, S., 2000b, Distinctive patterns of static and dynamic gamma motor activity during locomotion in the decerebrated catJournal of Physiology529, 825–836.
Whelan, P. J., and Pearson, K. G., 1997, Comparison of the effects of stimulating group I afferents on cycle period during walking in conscious and decerebrate catsExperimental Brain Research117, 444–452.
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Ellaway, P., Taylor, A., Durbaba, R., Rawlinson, S. (2002). Role of the Fusimotor System in Locomotion. In: Gandevia, S.C., Proske, U., Stuart, D.G. (eds) Sensorimotor Control of Movement and Posture. Advances in Experimental Medicine and Biology, vol 508. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0713-0_39
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DOI: https://doi.org/10.1007/978-1-4615-0713-0_39
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