Further studies of static and dynamic fusimotor fibres

Crowe, A.; Matthews, P. B. C.

doi:10.1113/jphysiol.1964.sp007477

Cited by 187 publications

(120 citation statements)

References 14 publications

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“…All were taken from one continuous recording. stretch but has little effect on the response during shortening (Crowe & Matthews, 1964;Lennerstrand & Thoden, 1968). The response during shortening is dominated by static fusimotor activity (see p. 211 of Matthews, 1972).…”

Section: Resultsmentioning

confidence: 99%

Fusimotor Influence on Jaw Muscle Spindle Activity during Swallowing‐Related Movements in the Cat

Taylor

Hidaka

Durbaba

et al. 1997

The Journal of Physiology

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The activity patterns of muscle spindle afferents in jaw‐closer muscles were studied during reflex swallowing movements in anaesthetized cats. Simultaneous records were made of the electromyogram (EMG) in masseter and anterior digastric muscles and of the unloaded jaw movements. The underlying patterns of fusimotor activity were deduced by comparing afferent discharges occurring during active swallowing with those occurring when exactly the same movements were imposed passively. The interpretation of spindle behaviour was greatly facilitated by characterizing the afferents according to the evidence for their contact with the various intrafusal muscle fibres, derived from testing with succinylcholine. It was also valuable to have two different types of afferent recorded simultaneously. There was clear evidence of fusimotor activity occurring during active jaw closing so as to oppose the spindle silencing. This effect was most marked in b2c‐type afferents (probably secondaries) and was therefore attributed to a modulation of static fusimotor discharge approximately in parallel with α‐activity. Afferents with evidence of bag1 fibre contacts (primaries) showed much greater sensitivity to muscle lengthening during active movement than when the movement was imposed. This difference was exaggerated when anaesthesia was deepened for the passive movements. This was interpreted as evidence for a higher level of dynamic fusimotor activity maintained during active movements than at rest. The results support the view that for a variety of active jaw movements, static fusimotor neurone firing is modulated roughly in parallel with α‐activity but leading it so as to counteract spindle unloading. Dynamic fusimotor neurone firing appears to be set at a raised level during active movements. Anaesthesia appears to depress activity in the α‐motoneurones more than in γ‐motoneurones.

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Section: Resultsmentioning

confidence: 99%

Fusimotor Influence on Jaw Muscle Spindle Activity during Swallowing‐Related Movements in the Cat

Taylor

Hidaka

Durbaba

et al. 1997

The Journal of Physiology

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“…As with soleus (Crowe & Matthews, 1964b), any individual fusimotor fibre was then found to produce the same action, whether static or dynamic, on all the endings that it influenced. In the eleven experiments (including those using both methods of selecting fusimotor fibres) sixteen endings were found to be influenced in a dynamic manner by fusimotor fibres, each of which had already been classified as a dynamic fibre by its action on another ending, and fifteen endings were found to be influenced in a static manner by fusimotor fibres, each of which had already been classified as a static fibre by its action on another ending.…”

Section: Fusimotor Fibres Of Tibialis Posteriormentioning

confidence: 99%

Observations on the fusimotor fibres of the tibialis posterior muscle of the cat

Brown¹,

Crowe²,

Matthews³

1965

The Journal of Physiology

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101

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“…Similar or larger sensitivities were found for de-efferented primary endings when the muscle tension was appreciable. During stimulation of dynamic fusimotor fibres the sinusoidal sensitivity may also be high (Crowe & Matthews, 1964).…”

Section: P 3pproceedings Of Thementioning

confidence: 99%

Proceedings of the Physiological Society, June 1968, Oxford Meeting: Communications

1968

The Journal of Physiology

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. The resistance 'loops' are displayed on an oscilloscope, and the tape record can be analysed subsequently by computer.The side of the pharynx is opened to expose the epipharynx, palate and epiglottis. Mechanical stimulation of the mucosa of the epipharynx, using a fine nylon fibre, and electrical stimulation of the pharyngeal branch of the glossopharyngeal nerve, cause short latency (15-25 msec) bursts of activity in the phrenic nerve, hypertension and bronchodilatation; the phrenic response is the counterpart of the 'aspiration reflex' caused by irritation of the epipharynx in non-paralysed cats (Tomori & Widdicombe, 1968). Electrical stimulation of the superior laryngeal nerve and mechanical stimulation of the lower respiratory tract cause bronchoconstriction, hypertension and various changes in phrenic discharge.

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Further studies of static and dynamic fusimotor fibres

Cited by 187 publications

References 14 publications

Fusimotor Influence on Jaw Muscle Spindle Activity during Swallowing‐Related Movements in the Cat

Fusimotor Influence on Jaw Muscle Spindle Activity during Swallowing‐Related Movements in the Cat

Observations on the fusimotor fibres of the tibialis posterior muscle of the cat

Proceedings of the Physiological Society, June 1968, Oxford Meeting: Communications

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