Understanding the Stretch Reflex by S. Homma

By S. Homma

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Occasionally the T i m e from end of stretch Fig. 4 . 2 mm at 1 . 8 mmlsec). Note marked creep in the slow nuclear bag fibre (a),the small creep in the fast nuclear bag fibre (o), and absence of creep in the nuclear chain fibres (A). Creep assessed from the approximation of the spirals of the primary ending round individual intrafusal fibres during the maintained stretch of the spindle. Creep amplitude, 32% of the applied stretch. Creep time, 2 . 4 sec. whole intrafusal bundle shows some creep, but it is usually confined to one of the nuclear bag fibres in any spindle.

Fast Fig. 8. Motor control and intrafusal behaviour of a, a particular spindle from the work of Boyd and Ward (1975), and b, a typical spindle from the work of Boyd e t al. (1975b). a : spindle operated by 6 axons numbered in order of increasing threshold t o stimulus applied to muscle nerve. Action of 7 3 negligible. 17 sec). Both nuclear bag fibres and nuclear chain fibres selectively innervated. , bundle of nuclear chain fibres. Slow nuclear bag fibre of a corresponds to dynamic nuclear bag fibre of 6.

In most cases the innervation of the spindle was intact, but it had no blood supply. The spindle was bathed in Krebs solution containing glucose, glutamine and amino acids. The fusimotor axons to the spindle were recruited by applying graded stimuli to the whole muscle nerve. Thus, all the fusimotor axons to the spindle (0and y) were activated in many cases, but it was not known which were “dynamic” and which were “static”. Active and passive intrafusal tension In 4 experiments the maximal tension developed by the whole intrafusal bundle was measured.

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