Contribution of the vestibular primary neuron and the sensory cell to posture recovery.
The right vestibular nerve of the frog was cut peripherally to the vestibular ganglion. The frog sustained a tilting posture toward the right side. This tilting disappeared and the frog returned to normal posture. Based on this finding, the following experiments were done: In experiment I, the right vestibular nerve was again cut after posture recovery. The tilting angle was smaller and the recovery period shorter than after the 1st neurectomy. In experiment II, the left nerve was cut after posture recovery. The tilting angle toward the left was greater than that of the 1st neurectomy. In experiment III, the frog underwent bilateral neurectomy. A piece of the bone was inserted into the cut ends of the right nerve to inhibit nerve regeneration. The frog slowly developed tilting toward the right side. The above results indicate that both reactivation of the endorgan and the central compensatory mechanism play essential roles, for postural recovery after vestibular neurectomy.
Suzuki
M
M
Department of Otolaryngology, Hiroshima University, School of Medicine, Japan.
Takahashi
H
H
Nikaido
M
M
Yoshida
S
S
Hirakawa
K
K
Harada
Y
Y
D000818:Animals; D001933:Brain Stem / Q000502:physiology; D004292:Dominance, Cerebral / Q000502:physiology; D008297:Male; D008959:Models, Neurological; D009416:Nerve Regeneration / Q000502:physiology; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011898:Ranidae; D014725:Vestibular Nerve / Q000502:physiology*