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At least 217 records · Page 12Linked to original sources
PubMed1998

Anatomical demonstration of a medullary enkephalinergic pathway potentially implicated in the oro-facial muscle atonia of paradoxical sleep in the cat.

The present study was aimed to compare in detail the distribution within the rostral ventromedial medulla of Methionin-Enkephalin-immunoreactive neurons with efferent projections to the facial or trigeminal motor nuclei, using a double immunostaining technique in colchicine-treated cats. Following cholera toxin B subunit injections in the facial or trigeminal motor nuclei, we found that respectively 55% and 65% of the medium to large-sized retrogradely labeled cells in the lateral part of the nucleus reticularis magnocellularis were Methionin-Enkephalin-positive. For both motor nuclei, the double-labeled neurons had similar morphology and size and were located exactly in the same area. They could therefore belong to the same population of reticular enkephalinergic neurons. Based on these and previous anatomical and electrophysiological data, we propose that these enkephalin-containing neurons could participate in the hyperpolarization of brainstem and spinal somatic motoneurons during paradoxical sleep.

Animals↗
PubMed1979

Facial muscle electromyography in depressed and nondepressed hospitalized subjects: a partial replication.

Imagining happy events, sad events, and the events of a typical day led to measurable electromyographic (EMG) changes in the corrugator muscle of the face in both depressed and nondepressed subjects. The depressed and nondepressed subjects could not be differentiated on the basis of muscle activity, whether depression was defined by a self-rating scale, an adjective checklist, or research criteria. Previous investigators have observed differences in the facial EMG patterns of depressed and nondepressed subjects who were not hospitalized; the authors suggest that such changes are a consequence of a general psychological stress state rather than of depression specifically.

Action Potentials↗
PubMed1988

Facioscapulohumeral dystrophy: jitter in facial muscles.

Motor end plate jitter was studied by single fibre EMG in the orbicularis oculi muscle of eight patients with facioscapulohumeral dystrophy activated by extramuscular nerve stimulation. The jitter was found to be slightly larger in comparison with the normal controls, although still within the normal limits in each patient. The findings are considered to indicate absence of any significant neuromuscular transmission disturbance, inflammatory or regenerative process, or reinnervation in progress. There was no evidence of muscle fibre conduction abnormality even in very weak muscle.

Adolescent↗