Abstract：
:The facial nucleus (FN) has been known as a motor nucleus to control the activity of the facial skeletal muscles by its efferent somatic motoneurons. Much less, however, is known about the non-motor control functions of its interneurons. The present study was designed to investigate if the interneurons of the FN participate in controlling rhythmic respiration in the sodium thiopental-anesthetized and vagotomized Sprague-Dawley rats with facial motoneurons retrogradely degenerated with techniques of electrical and chemical stimulation of the FN and extracellular recording of discharge of neurons in the FN. Single pulse stimulation (75-100 microA, 0.2 ms) of the FN during inspiration caused a transient restrain in phrenic discharge. Short train stimulation (75-100 microA, 0.2 ms, 100 Hz, 3-5 pulses) delivered during the early- or mid-term of inspiration augmented the inspiratory duration, but switched the inspiration off when delivered during the later stage of inspiration. Short train stimulation delivered during expiration prolonged the expiratory duration. Continuous stimulation could inhibit the inspiration. Microinjection of kainic acid into the FN caused an augmentation in inspiratory duration and amplitude and in expiratory duration. These data indicate that the interneurons of the FN might participate in the modulation of respiration. Different discharge patterns of interneurons in the FN, interestingly some respiratory related patterns, were observed, which provide a possible structural basis for the role of the FN in respiratory regulation.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Zhang C,Yan H,Li C,Zheng Ydoi
10.1016/j.neulet.2004.06.047keywords:
subject
Has Abstractpub_date
2004-09-09 00:00:00pages
283-8issue
3eissn
0304-3940issn
1872-7972pii
S0304-3940(04)00771-2journal_volume
367pub_type
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