Uchino Y, Sasaki M, Sato H, Imagawa M, Suwa H, Isu N
Department of Physiology, Tokyo Medical College, Japan.
Acta Otolaryngol Suppl. 1997;528:44-8.
Intracellular recordings from 200 identified extraocular motoneurons in the bilateral III, IV and VI cranial nuclei were studied to determine the connectivities between the utricular nerve and the extraocular motoneurons in cats. Stimulating electrodes were placed within the left utricular nerve, while other branches of the vestibular nerve were removed. Monosynaptic and disynaptic connections between the utricular nerve and the ipsilateral abducens motoneurons and interneurons were recorded as described previously. Stimulation of the utricular nerve evoked longer latency depolarizing and hyperpolarizing potentials in contra- and ipsilateral medial rectus motoneurons, respectively. Depolarizing and hyperpolarizing potentials with longer latencies were also recorded in the ipsilateral inferior oblique and contralateral trochlear motoneurons. The short and longer latency circuits between the utricular nerve and extraocular motoneurons may play a role in stabilizing the retinal image during head tilt and horizontal linear acceleration.
对猫双侧动眼神经核、滑车神经核及展神经核中200个已鉴定的眼外肌运动神经元进行细胞内记录，以确定椭圆囊神经与眼外肌运动神经元之间的连接。刺激电极置于左侧椭圆囊神经内，同时切断前庭神经的其他分支。如前所述，记录椭圆囊神经与同侧展神经运动神经元及中间神经元之间的单突触和双突触连接。刺激椭圆囊神经分别在对侧和同侧内直肌运动神经元中诱发潜伏期更长的去极化和超极化电位。在同侧下斜肌和对侧滑车神经运动神经元中也记录到潜伏期更长的去极化和超极化电位。椭圆囊神经与眼外肌运动神经元之间潜伏期短和长的神经回路可能在头部倾斜和水平线性加速过程中稳定视网膜图像方面发挥作用。
