Tabata T, Karita K
Department of Physiology, Tohoku University School of Dentistry, Sendai, Japan.
Exp Brain Res. 1991;84(3):583-90. doi: 10.1007/BF00230970.
Periodontal mechanosensitive units (PM units) were recorded from the trigeminal main sensory nucleus (Vms) of the cat. The receptive fields of PM units were arranged from mandibular to maxillary divisions dorso-ventrally. The majority of PM units were single tooth units responsive to the canine tooth. They were directionally selective and had sustained responses to pressure applied to the tooth. The optimal stimulus direction of maxillary and mandibular PM units when the canine tooth was stimulated was single and it was oriented predominantly in the caudio-medial or rostrolateral direction. The threshold intensity of canine tooth stimulation was less than 0.05 N in most of the units. These findings indicate that the response properties of PM units in the Vms resemble fairly closely those of the primary afferent nerves arising from the periodontal mechanoreceptors.
从猫的三叉神经主感觉核（Vms）记录牙周机械敏感单元（PM单元）。PM单元的感受野从下颌部分到上颌部分背腹向排列。大多数PM单元是对犬齿有反应的单牙单元。它们具有方向选择性，并且对施加于牙齿的压力有持续反应。刺激犬齿时，上颌和下颌PM单元的最佳刺激方向是单一的，主要朝向尾内侧或嘴外侧。大多数单元中犬齿刺激的阈值强度小于0.05N。这些发现表明，Vms中PM单元的反应特性与源自牙周机械感受器的初级传入神经的反应特性相当接近。
