Uchino Y, Hirai N, Watanabe S
Exp Brain Res. 1978 Jul 14;32(3):377-88. doi: 10.1007/BF00238709.
In the anesthetized cat, the posterior canal nerve (PCN) was stimulated by electric pulses and synaptic responses were recorded intracellularly in the three antagonistic pairs of extraocular motoneurons. Pure reciprocal effects were obtained in the motoneurons innervating the antagonistic pair of ipsilateral oblique muscles and the antagonistic pair of contralateral vertical rectus muscles. These responses consisted of low threshold disynaptic excitatory postsynaptic potentials (EPSPs) in either the contralateral superior oblique (c--SO) (trochlear) or contralateral inferior rectus (c--IR) motoneurons and of disynaptic inhibitory postsynaptic potentials (IPSPs) in either the ipsilateral inferior oblique (i--IO) or ipsilateral superior rectus (i--SR) motoneurons. In addition, disynaptic IPSPs were also found in (i--SO) motoneurons. Mixtures of low threshold (di or trisynaptic) EPSPs and IPSPs were found in all other extraocular motoneurons except for the contralateral lateral rectus (c--LR) motoneurons. These results may afford a basis for the characteristic eye movements induced by vertical canal nerve stimulation.
在麻醉猫中，用电脉冲刺激后半规管神经（PCN），并在三对拮抗的眼外运动神经元中进行细胞内突触反应记录。在支配同侧斜肌拮抗对和对侧垂直直肌拮抗对的运动神经元中获得了纯粹的交互作用。这些反应包括对侧上斜肌（c-SO）（滑车神经）或对侧下直肌（c-IR）运动神经元中的低阈值双突触兴奋性突触后电位（EPSP），以及同侧下斜肌（i-IO）或同侧上直肌（i-SR）运动神经元中的双突触抑制性突触后电位（IPSP）。此外，在（i-SO）运动神经元中也发现了双突触IPSP。除对侧外直肌（c-LR）运动神经元外，在所有其他眼外运动神经元中均发现了低阈值（双突触或三突触）EPSP和IPSP的混合。这些结果可能为垂直半规管神经刺激引起的特征性眼球运动提供了基础。
