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. 1981 Jun;315:59–67. doi: 10.1113/jphysiol.1981.sp013732

The recruitment order of gamma-motoneurones in the decerebrate rabbit.

P R Murphy
PMCID: PMC1249367  PMID: 7310723

Abstract

1. The order of firing (i.e. recruitment order) of gastrocnemius medialis gamma-motoneurones to natural stimulation of the limbs has been studied in the precollicular decerebrate rabbit. 2. Recruitment order was not invariable. However, when a fixed order occurred there was a significant tendency for neurones to be recruited in order of increasing axonal conduction velocity. The functional significance of this finding is discussed. 3. In the preparation used, many gamma-motoneurones were spontaneously active. 4. Two types of gamma-motoneurone were distinguished on the basis of their resting discharge characteristics and responses to natural stimulation. 5. A significant correlation between resting discharge frequency and axonal conduction velocity was found for gamma-motoneurones that were predominantly excited by natural stimulation.

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Selected References

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  1. APPELBERG B., EMONET-DENAND F. CENTRAL CONTROL OF STATIC AND DYNAMIC SENSITIVITIES OF MUSCLE SPINDLE PRIMARY ENDINGS. Acta Physiol Scand. 1965 Apr;63:487–494. doi: 10.1111/j.1748-1716.1965.tb04093.x. [DOI] [PubMed] [Google Scholar]
  2. BROWN M. C., CROWE A., MATTHEWS P. B. OBSERVATIONS ON THE FUSIMOTOR FIBRES OF THE TIBIALIS POSTERIOR MUSCLE OF THE CAT. J Physiol. 1965 Mar;177:140–159. doi: 10.1113/jphysiol.1965.sp007582. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Barrett J. N., Crill W. E. Specific membrane resistivity of dye-injected cat motoneurons. Brain Res. 1971 May 21;28(3):556–561. doi: 10.1016/0006-8993(71)90066-7. [DOI] [PubMed] [Google Scholar]
  4. Burke D., Hagbarth K. E., Skuse N. F. Recruitment order of human spindle endings in isometric voluntary contractions. J Physiol. 1978 Dec;285:101–112. doi: 10.1113/jphysiol.1978.sp012560. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Cullheim S., Ulfhake B. Observations on the morphology of intracellularly stained gamma-motoneurons in relation to their axon conduction velocity. Neurosci Lett. 1979 Jun;13(1):47–50. doi: 10.1016/0304-3940(79)90073-9. [DOI] [PubMed] [Google Scholar]
  6. ECCLES J. C., ECCLES R. M., IGGO A., LUNDBERG A. Electrophysiological studies on gamma motoneurones. Acta Physiol Scand. 1960 Sep 30;50:32–40. doi: 10.1111/j.1748-1716.1960.tb02070.x. [DOI] [PubMed] [Google Scholar]
  7. ECCLES J. C., ECCLES R. M., LUNDBERG A. The action potentials of the alpha motoneurones supplying fast and slow muscles. J Physiol. 1958 Jul 14;142(2):275–291. doi: 10.1113/jphysiol.1958.sp006015. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Ellaway P. H., Murphy P. R., Pascoe J. E., Read G. L. Use of a delay line to measure conduction velocity of an axon [proceedings]. J Physiol. 1978 Jul;280:5P–6P. [PubMed] [Google Scholar]
  9. Ellaway P., Emonet-Dénand F., Jami L., Joffroy M. Proportion des fibres fusimotrices statiques et dynamiques dans les muscles peroneus longus et flexor hallucis longus du chat. C R Acad Sci Hebd Seances Acad Sci D. 1972 Jun 26;274(26):3597–3600. [PubMed] [Google Scholar]
  10. Franz D. N., Iggo A. Conduction failure in myelinated and non-myelinated axons at low temperatures. J Physiol. 1968 Dec;199(2):319–345. doi: 10.1113/jphysiol.1968.sp008656. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Grimby L., Hannerz J. Recruitment order of motor units on voluntary contraction: changes induced by proprioceptive afferent activity. J Neurol Neurosurg Psychiatry. 1968 Dec;31(6):565–573. doi: 10.1136/jnnp.31.6.565. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Gustafsson B., Lipski J. Do gamma-motoneurons lack a long-lasting afterhyperpolarization? Brain Res. 1979 Aug 24;172(2):349–353. doi: 10.1016/0006-8993(79)90545-6. [DOI] [PubMed] [Google Scholar]
  13. HENNEMAN E., OLSON C. B. RELATIONS BETWEEN STRUCTURE AND FUNCTION IN THE DESIGN OF SKELETAL MUSCLES. J Neurophysiol. 1965 May;28:581–598. doi: 10.1152/jn.1965.28.3.581. [DOI] [PubMed] [Google Scholar]
  14. HENNEMAN E., SOMJEN G., CARPENTER D. O. FUNCTIONAL SIGNIFICANCE OF CELL SIZE IN SPINAL MOTONEURONS. J Neurophysiol. 1965 May;28:560–580. doi: 10.1152/jn.1965.28.3.560. [DOI] [PubMed] [Google Scholar]
  15. HUNT C. C., PAINTAL A. S. Spinal reflex regulation of fusimotor neurones. J Physiol. 1958 Sep 23;143(2):195–212. doi: 10.1113/jphysiol.1958.sp006053. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. HUNT C. C. The reflex activity of mammalian small-nerve fibres. J Physiol. 1951 Dec 28;115(4):456–469. doi: 10.1113/jphysiol.1951.sp004681. [DOI] [PMC free article] [PubMed] [Google Scholar]
  17. Henneman E., Clamann H. P., Gillies J. D., Skinner R. D. Rank order of motoneurons within a pool: law of combination. J Neurophysiol. 1974 Nov;37(6):1338–1349. doi: 10.1152/jn.1974.37.6.1338. [DOI] [PubMed] [Google Scholar]
  18. JANSEN J. K., MATTHEWS P. B. The central control of the dynamic response of muscle spindle receptors. J Physiol. 1962 May;161:357–378. doi: 10.1113/jphysiol.1962.sp006892. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. JANSEN J. K., MATTHEWS P. B. The effects of fusimotor activity on the static responsiveness of primary and secondary endings of muscle spindles in the decerebrate cat. Acta Physiol Scand. 1962 Aug;55:376–386. doi: 10.1111/j.1748-1716.1962.tb02451.x. [DOI] [PubMed] [Google Scholar]
  20. Kemm R. E., Westbury D. R. Some properties of spinal gamma-motoneurones in the cat, determined by micro-electrode recording. J Physiol. 1978 Sep;282:59–71. doi: 10.1113/jphysiol.1978.sp012448. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Kernell D. Input resistance, electrical excitability, and size of ventral horn cells in cat spinal cord. Science. 1966 Jun 17;152(3729):1637–1640. doi: 10.1126/science.152.3729.1637. [DOI] [PubMed] [Google Scholar]
  22. Kernell D., Sjöholm H. Recruitment and firing rate modulation of motor unit tension in a small muscle of the cat's foot. Brain Res. 1975 Nov 7;98(1):57–72. doi: 10.1016/0006-8993(75)90509-0. [DOI] [PubMed] [Google Scholar]
  23. MATTHEWS P. B. The differentiation of two types of fusimotor fibre by their effects on the dynamic response of muscle spindle primary endings. Q J Exp Physiol Cogn Med Sci. 1962 Oct;47:324–333. doi: 10.1113/expphysiol.1962.sp001616. [DOI] [PubMed] [Google Scholar]
  24. Milner-Brown H. S., Stein R. B., Yemm R. The orderly recruitment of human motor units during voluntary isometric contractions. J Physiol. 1973 Apr;230(2):359–370. doi: 10.1113/jphysiol.1973.sp010192. [DOI] [PMC free article] [PubMed] [Google Scholar]
  25. Stephens J. A., Stuart D. G. The motor units of cat medial gastrocnemius: speed-size relations and their significance for the recruitment order of mortor units. Brain Res. 1975 Jun 27;91(2):177–195. doi: 10.1016/0006-8993(75)90542-9. [DOI] [PubMed] [Google Scholar]
  26. Stephens J. A., Usherwood T. P. The mechanical properties of human motor units with special reference to their fatiguability and recruitment threshold. Brain Res. 1977 Apr 8;125(1):91–97. doi: 10.1016/0006-8993(77)90361-4. [DOI] [PubMed] [Google Scholar]
  27. VOORHOEVE P. E., van KANTEN R. Reflex behaviour of fusimotor neurones of the cat upon electrical stimulation of various afferent fibers. Acta Physiol Pharmacol Neerl. 1962;10:391–407. [PubMed] [Google Scholar]
  28. Waldron I., Wachtel G. M. Lack of fixed order of recruitment in cat motoneuron pools. Exp Brain Res. 1974;20(2):101–114. doi: 10.1007/BF00234005. [DOI] [PubMed] [Google Scholar]

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