Tolu E, Pugliatti M, Lacana P, Chessa G, Caria M A, Simula M E
Institute of Human Physiology, School of Medicine, University of Sassari, Italy.
J Vestib Res. 1994 Jul-Aug;4(4):303-11.
The aim of the research was to investigate whether somatosensory impulses starting from the forelimbs could modulate masseter muscle activity in anesthetized guinea pigs. The effect of interactions between radial nerve and vestibular stimulations on the masseter motor unit responses was also studied. Results show that electrical stimulation of both radial nerves induces responses in the masseter motor units most frequently characterized by excitation at latency ranging from 14 to 29 ms. The radial nerve responses were strongly reduced by conditioning electrical stimulation of the vestibular ampullar receptors. Similarly, the vestibular responses were reduced by conditioning radial nerve stimulation. The natural activation of the vestibular macular receptors can either decrease or increase the masseter motor unit responses evoked by electrical stimulation of the radial nerve. These complex inhibitory-excitatory interactions between the two sensory inputs could control the masseter postural tone in relation to the head and limb positions in space.
该研究的目的是调查源自前肢的体感冲动是否能调节麻醉豚鼠的咬肌活动。还研究了桡神经和前庭刺激之间的相互作用对咬肌运动单位反应的影响。结果表明，双侧桡神经的电刺激最常诱发咬肌运动单位的反应，其特征为潜伏期在14至29毫秒之间的兴奋。通过对前庭壶腹感受器进行条件性电刺激，桡神经反应明显减弱。同样，通过对桡神经进行条件性刺激，前庭反应也会减弱。前庭黄斑感受器的自然激活既可以减少也可以增加由桡神经电刺激诱发的咬肌运动单位反应。这两种感觉输入之间复杂的抑制 - 兴奋相互作用可以控制与头部和肢体在空间中的位置相关的咬肌姿势张力。
