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The use of midbrain stimulation to identify the discharges of static and dynamic fusimotor neurones during reflex jaw movements in the anaesthetized cat
Author(s) -
Donga R,
Taylor A,
Juch PJ
Publication year - 1993
Publication title -
experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0958-0670
DOI - 10.1113/expphysiol.1993.sp003667
Subject(s) - tonic (physiology) , midbrain , reflex , stimulation , muscle spindle , cats , chemistry , anatomy , masseter muscle , neuroscience , medicine , biology , central nervous system , afferent
In anaesthetized cats, it was possible to enhance the dynamic sensitivity to stretch of jaw muscle spindle primary afferents by electrical stimulation in the midbrain. This effect was taken to be due to excitation of dynamic fusimotor neurones and was used to identify fusimotor fibres as static or dynamic in recordings from the masseter nerve. During reflex movements, some fusimotor fibres fired tonically, while others were markedly modulated with increases in firing corresponding approximately to muscle shortening. The modulated group had a significantly higher mean resting firing frequency than the tonic group. Midbrain stimulation at points shown to produce dynamic effects on muscle spindle primary afferents increased the discharge frequency of the tonic fusimotor units, but did not significantly affect the modulated fusimotor units. We conclude that the fusimotor fibres in the masseter nerve which fire tonically during reflex jaw movements are probably of the dynamic type, while those which show strongly modulated increases in firing are probably static.