Morphological analysis of cat masseteric motoneurons after intracellular staining with horseradish peroxidase

Brain Research
H KamogawaT Inage

Abstract

Intracellular injection of horseradish peroxidase (HRP) into 58 masseteric motoneurons identified by antidromic activation was performed in cats under pentobarbital anesthesia. Monosynaptic EPSPs were evoked by masseteric nerve stimuli in 52 cells, and were absent in the remaining six cells. The antidromic nature of the evoked spikes was confirmed by IS-SD separation observed at high frequency (50 Hz) stimulation. Motoneurons with monosynaptic excitation from masseter afferents showed IPSPs following stimulation of lingual and inferior alveolar nerves. Motoneurons which did not show monosynaptic excitation from masseter afferents showed no IPSPs from the above nerves. There were no differences in cell size or the number of stem dendrites between motoneurons with and without monosynaptic EPSPs. No recurrent collaterals were observed in any motor axons. Motoneurons with monosynaptic EPSPs were located at all rostrocaudal levels throughout the trigeminal motor nucleus, whereas motoneurons without such EPSPs were encountered only at the middle level. Dendrites of motoneurons with monosynaptic EPSPs did not extend into the medial portion of the nucleus where motoneurons innervating the anterior belly of the digastric muscle were loc...Continue Reading

References

Aug 1, 1980·The Journal of Physiology·K AppentengA Taylor
Jul 20, 1982·The Journal of Comparative Neurology·R E BurkeM J Pinter
Feb 1, 1949·The Journal of Comparative Neurology·J SZENTAGOTHAI

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Citations

Dec 1, 2006·Experimental Brain Research·K S TürkerJ P Vedel
Sep 12, 2008·The European Journal of Neuroscience·Sarah McDavidArlette Kolta
Mar 4, 2008·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Paul F SowmanMichael A Nordstrom

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