HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Full Text (PDF) Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Zeredo, J.L. Articles by Soma, K. Search for Related Content PubMed PubMed Citation Articles by Zeredo, J.L. Articles by Soma, K.

Nature of Neck Motor Unit Activities Evoked by Different Trigeminal Inputs in Rats

¹ Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; and
² Division of Integrative Sensory Physiology, Department of Developmental and Reconstructive Medicine, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8588, Japan;

View larger version (12K): [in a new window]   Figure 1. Short-latency, phasic SPL motor unit responses evoked by (A) Me5 and (B) 5Gn electrical stimulation (1.5 times the response threshold). (A) Me5 electrical stimulation at 20 µA evoked ipsilateral (top) SPL spikes with 1.3-ms latency, but failed to evoke contralateral (bottom) spike responses. (B) Ipsi- and contralateral SPL discharges with 2.2-ms latency, evoked by 5Gn electrical stimulation at 50 µA. Arrows indicate stimulus artifacts.

View larger version (23K): [in a new window]   Figure 2. Schematic representation of the Me5 drawn from coronal sections of the brainstem, -9.1 mm posterior to bregma. An asterisk indicates the stimulated site. 4V, fourth ventricle; IRt, intermediate reticular nucleus; LC, locus coeruleus; Me5, trigeminal mesencephalic nucleus; Pr5, principal sensory trigeminal nucleus; py, pyramidal tract; sp5, spinal trigeminal tract; ts, tectospinal tract.

View larger version (15K): [in a new window]   Figure 3. Latency histograms of spike responses generated from SPL motor units (30 bins of 0.1 ms each). (A) Responses evoked by above-threshold Me5 (ipsilateral, 390 responses), and (B) 5Gn electrical stimulation (ipsi- 2.3 ms ± 0.05 SD, 100 responses; contralateral 2.3 ms ± 0.05 SD, 53 responses).

View larger version (14K): [in a new window]   Figure 4. SPL motor unit responses were evoked by 5Gn electrical stimulation (A) before and (B) after injection of Xylocaine into the ipsilateral Me5. No difference was observed in the onset latency or stimulus threshold. Arrows indicate stimulus artifacts.