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We sought to identify those cells involved in the generation of atonia of the masseter muscles during active sleep. A neuronal population was examined in the medullary reticular formation which has been shown to project monosynaptically to trigeminal motoneurons and provide inhibitory input to them. These neurons exhibited a pattern of state-dependent discharge which was characterized by a tonic increase in firing frequency which paralleled the tonic decrease in somatomotor reflex activity (within the trigeminal system) in the continuum of wakefulness to quiet (NREM) sleep to active sleep. This population of cells discharged at extremely high rates during active sleep, especially during periods of rapid eye movements, when postsynaptic inhibitory control of motoneurons is most prominent. We therefore suggest that these medullary units are the inhibitory neurons which are responsible for the postsynaptic inhibition of trigeminal motoneurons during active sleep.
M H Chase, and
S Enomoto, and
K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
December 1979,
Brain research,
M H Chase, and
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M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
September 1990,
Kokubyo Gakkai zasshi. The Journal of the Stomatological Society, Japan,
M H Chase, and
S Enomoto, and
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M Taira
July 1984,
Experimental neurology,
M H Chase, and
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K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
September 1992,
Neuroscience research,
M H Chase, and
S Enomoto, and
K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
August 1980,
Journal of neurophysiology,
M H Chase, and
S Enomoto, and
K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
November 1982,
Experimental neurology,
M H Chase, and
S Enomoto, and
K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
February 2017,
Cell metabolism,
M H Chase, and
S Enomoto, and
K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
May 1991,
Brain research,
M H Chase, and
S Enomoto, and
K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
August 1994,
Brain research,
M H Chase, and
S Enomoto, and
K Hiraba, and
M Katoh, and
Y Nakamura, and
Y Sahara, and
M Taira
April 1990,
Brain research,
