1976
DOI: 10.1113/jphysiol.1976.sp011548
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Distribution of fusimotor axons to intrafusal muscle fibres in cat tenuissimus spindles as determined by the glycogen‐depletion method.

Abstract: SUMMARY1. The distribution of fusimotor axons to bag1, bag2 and chain muscle fibres in cat tenuissimus spindles has been studied using a modification of the glycogen-depletion technique of Edstr6m & Kugelberg (1968). Single fusimotor axons were stimulated intermittently at 40-100/sec for long periods (30-90 sec) during blood occlusion. Portions of muscle containing the activated spindles were quick-frozen, fixed in absolute ethanol during freeze-substitution, and then embedded in paraffin wax. Serial transver… Show more

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Cited by 63 publications
(46 citation statements)
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“…12 we found that of forty-four examples of predominantly dynamic action, thirty-four were category I and ten were category II responses. This gives a figure of 77 % of dynamic actions being apparently 'pure', which agrees closely with the corresponding value of 81 % for the proportion of the occasions in a glycogen depletion study (Barker et al 1976) in which dynamic y stimulation depleted a bag1 fibre on its own rather than along with a bag2 or a chain fibre. Barker et al (1976) did not correlate patterns of glycogen depletion with categories of responses largely because these had yet to be fully delimited.…”
Section: Discussionsupporting
confidence: 77%
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“…12 we found that of forty-four examples of predominantly dynamic action, thirty-four were category I and ten were category II responses. This gives a figure of 77 % of dynamic actions being apparently 'pure', which agrees closely with the corresponding value of 81 % for the proportion of the occasions in a glycogen depletion study (Barker et al 1976) in which dynamic y stimulation depleted a bag1 fibre on its own rather than along with a bag2 or a chain fibre. Barker et al (1976) did not correlate patterns of glycogen depletion with categories of responses largely because these had yet to be fully delimited.…”
Section: Discussionsupporting
confidence: 77%
“…This gives a figure of 77 % of dynamic actions being apparently 'pure', which agrees closely with the corresponding value of 81 % for the proportion of the occasions in a glycogen depletion study (Barker et al 1976) in which dynamic y stimulation depleted a bag1 fibre on its own rather than along with a bag2 or a chain fibre. Barker et al (1976) did not correlate patterns of glycogen depletion with categories of responses largely because these had yet to be fully delimited. But there were also technical reasons; the tenuissimus muscle on which their histophysiological study was carried out is very compliant and even when a fraction of that muscle is used, its various spindles are not evenly 856…”
Section: Discussionsupporting
confidence: 77%
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“…Quite often, however, more than one nuclear bag fibre was affected and sometimes one or two chain fibres were involved. Barker et al (1975Barker et al ( , 1976 found that dynamic y and , axons usually depleted bag1 fibres only, but bag2 fibres and the occasional chain fibre could show depletion. The depletion of bag1 fibres by dynamic axons is consistent with the present work, but not the depletion of bag2 fibres or chain fibres.…”
Section: Glycogen Depletion In Intrafusal Fibresmentioning
confidence: 99%
“…This is likely to be substantially longer for fibres activated by static axons (chains and bag 2; cf. Brown & Butler, 1973Bessou & Pages, 1975;Boyd, 1976a, b;Barker, Emonet-Denand, Harker, Jami & Laporte, 1976) than for dynamic activated fibres (bag 1), since statics but not dynamics tend to provoke propagated action potentials and occasionally even full-length activation of intrafusal fibres (Bessou fibres is smaller than the length of the bag 1 fibres (Barker, 1974;Barker et al 1976). Indeed, from the published data of Bessou & Pages (1975) it would appear that the speed of contraction induced by static fibres, measured by its time constant, exceeded dynamic action only by a factor of about 2.…”
Section: Speed Offusimotor Actionmentioning
confidence: 99%