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Effect of afferent signals from the periodontal ligament onadrenal medullary function in rats.

  • Ikeda Keisuke
    <I>Department of Removable Prosthodontics, School of Dentistry, Niigata University</I>
  • Shingai Tomio
    <I>Department of Oral Physiology, School of Dentistry, Niigata University</I>
  • Takahashi Yoshihiro
    <I>Department of Oral Physiology, School of Dentistry, Niigata University</I>
  • Yamada Yoshiaki
    <I>Department of Oral Physiology, School of Dentistry, Niigata University</I>
  • Kohno Shoji
    <I>Department of Removable Prosthodontics, School of Dentistry, Niigata University</I>

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Other Title
  • 歯根膜感覚情報がラット副腎髄質機能に及ぼす影響

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Abstract

The effect of afferent signals from the periodontal ligament and muscle spindles of jaw-closing muscles on adrenal medullary function is not known. We approached this matter through analysis of adrenal sympathetic nerve activity, trajectories of jaw movements, and EMG activity of the masseter muscle recorded simultaneously in anesthetized rats. Rhythmic jaw movements (RJM) were evoked by repetitive electrical stimulation of the cerebral cortex.<BR>There was no significant change in the adrenal nerve activity during RJM. When a 2 mm-thick wooden stick was placed between the opposing incisors during RJM, the activities of the masseter muscle and the adrenal nerve were facilitated. The facilitative response of the adrenal nerve returned to the pre-stimulus level after the wooden stick was withdrawn. After sectioning the bilateral maxillary and inferior alveolar nerves, the facilitative response to the masseteric activity due to application of the wooden stick became greatly reduced but no significant change was seen in the adrenal nerve activity. The masseteric activity increased while the jaw was stretched during RJM to increase the afferent signals from the muscle spindles; however, the adrenal nerve activity did not change significantly. Adrenal nerve activity was facilitated when pressure stimulation was applied manually to the upper incisors. The facilitative effect was much greater during repetitive stimulation to the teeth than that observed during continuous stimulation.<BR>These results indicate that afferent signals from the periodontal ligament are responsible for the facilitation of adrenal nerve activity.

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