猫中·间脑结合部神经元与眼球下斜肌运动神经元的直接突触联系

本文应用神经元自发放电触发的迭加平均法,研究了猫中·间脑结合部内侧区神经元与眼球下斜肌运动神经元（inferiorobliquemotoneurons,IOMNs）之间的突触联系。电刺激同侧或对侧中·间脑结合部的Forel'sfieldeH（FFH）的内侧区（A7～Ag）,在IOMN池内记录到兴奋性单突触电场电位。应用FFH神经元的自发放电作为触发信号,将此放电引起的IOMNs的电位变化进行迭加平均,结果亦获得一兴奋性单突触电场电位。这些结果表明,中·间脑结合部内侧区神经元与IOMNs之间存在兴奋性单突触联系,其作用为启动眼球的垂直运动。

Monosynaptic transmission between mesodiencephalic neurons and motoneurons innervating extraocular inferior oblique muscle in cats

The present study was performed to define the synaptic connection of neurons located within the dorsal mesodiencephalic junction with motoneurons innervating extraocular inferior oblique muscle(IOMN)using electrophysiologic,especially spike-triggered averaging technique in cats.In response to electric shocks applied to the medial part of Forel's field H(FFH) located in the mesodiencephalic junction,excitatory monosynaptic field potentials were observed in the IOMN pool.Moreover,while the spontaneous discharges of FFH neurons were used to trigger the activity of IOMN pool from which the induced potential changes were averaged,an excitatory monosynaptic field potential was also obtained.These results indicate that the mesodiencephalic neurons connect with and activate the IOMNs monosynaptically,and drive venical eye movements via such a way.