[Histological identification of brainstem neurons related to generation of rhythmical jaw movements in the rat].
Rhythmical jaw movements (RJM) were induced by stimulation of the oral cavity or the cerebral peduncle in the anesthetized rat. We found that the phase-dependent rhythmical (RJM-phasic) neuronal activities were necessary for the generation of RJM and iontophoretic application of glutamate activated a small number of these neurons rhythmically in phase with simultaneous RJM (Glu-RJM-phasic neurons) although it activated most RJM-phasic neurons tonically without RJM. N-(2-aminoethyl) biotinamide hydrochloride was iontophoretically applied to visualize these neurons. An identified Glu-RJM-phasic neuron had the complicated outline of soma with eight or more short and long dendrites. The RJM-phasic neurons had the simple outlines of soma (fusiform, triangular or rhomboid) with several short dendrites. Differential activation by glutamate corresponded to differential morphological characteristics of the brainstem neurons related to RJM-generation.
Department of Oral Physiology, Faculty of Dentistry, Kyushu University, Fukuoka, Japan.
M
M
Ohta
S
S
Ishizuka
K
K
Sasamoto
K
K
Nishimuta
K
K
Mishima
D000818:Animals; D001710:Biotin / Q000031:analogs & derivatives; D001933:Brain Stem / Q000166:cytology*; D005971:Glutamates / Q000494:pharmacology; D007568:Jaw / Q000294:innervation / Q000502:physiology*; D008297:Male; D009068:Movement; D009474:Neurons / Q000166:cytology / Q000502:physiology*; D010507:Periodicity; D051381:Rats; D017208:Rats, Wistar; D013194:Staining and Labeling
D005971:Glutamates; C070614:neurobiotin; D001710:Biotin