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Titolo:
FUSIMOTOR INFLUENCE ON JAW MUSCLE-SPINDLE ACTIVITY DURING SWALLOWING-RELATED MOVEMENTS IN THE CAT
Autore:
TAYLOR A; HIDAKA O; DURBABA R; ELLAWAY PH;
Indirizzi:
CHARING CROSS & WESTMINSTER MED SCH,DEPT PHYSIOL,FULHAM PALACE RD LONDON W6 8RF ENGLAND
Titolo Testata:
Journal of physiology
fascicolo: 1, volume: 503, anno: 1997,
pagine: 157 - 167
SICI:
0022-3751(1997)503:1<157:FIOJMA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTERIOR THIGH MUSCLES; FICTIVE LOCOMOTION; CLOSING MUSCLES; MIDBRAIN STIMULATION; PREMAMMILLARY CATS; GAMMA-MOTONEURONS; ANESTHETIZED CAT; DECEREBRATE CAT; MASSETER NERVE; IMPULSE RATES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
A. Taylor et al., "FUSIMOTOR INFLUENCE ON JAW MUSCLE-SPINDLE ACTIVITY DURING SWALLOWING-RELATED MOVEMENTS IN THE CAT", Journal of physiology, 503(1), 1997, pp. 157-167

Abstract

1. The activity patterns of muscle spindle afferents in jaw-closer muscles were studied during reflex swallowing movements in anaesthetizedcats. 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. 2. There was clear evidence of fusimotoractivity occurring during active jam closing so as to oppose the spindle silencing. This effect was most marked in b(2)c-type afferents (probably secondaries) and was therefore attributed to a modulation of static fusimotor discharge approximately in parallel with alpha-activity. 3. Afferents with evidence of bag, fibre contacts (primaries) showedmuch greater sensitivity to muscle lengthening during act ive 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. 4. The results supportthe view that for a variety of active jaw movements, static fusimotorneurone firing is modulated roughly in parallel with alpha-activity but leading it so as to counteract spindle unloading. Dynamic fusimotorneurone firing appears to be set at a raised level during active movements. Anaesthesia appears to depress activity in the a-motoneurones more than in gamma-motoneurones.

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Documento generato il 28/09/20 alle ore 17:33:34