Synaptic Organization Between the Ampullary Nerve of the Horizontal Semicircular Canal and Cat Extraocular Motoneurons

DOI Web Site
  • UCHINO Yoshio
    Department of physiology, Kyorin University School of Medicine
  • SUZUKI Hideji
    Department of physiology, Kyorin University School of Medicine
  • WATANABE Shiro
    Department of physiology, Kyorin University School of Medicine
  • MIYAZAWA Taeko
    Department of Physiology, Nihon University School of Medicine

Bibliographic Information

Other Title
  • 水平半規管眼反射弓の神経機構
  • スイヘイ ハンキカンガン ハンシャ キュウ ノ シンケイ キコウ

Search this article

Description

1. Synaptic potentials were recorded in identified extraocular motoneurons in the anesthetized cat, following stimulation of the horizontal canal nerve (HCN). 2. Weak stimulation of the HCN evoked disynaptic EPSPs in ipsilateral medial rectus (i-MR), contralateral lateral rectus (c-LR) and disynaptic IPSPs in i-LR motoneurons. 3. Weak stimulation of the HCN produced longer latency IPSPs (probably trisynaptic) in c-MR motoneurons. It is suggested that the HCN projects to an excitatory interneuron in the vestibular nucleus whose axon in turn projects to a third order inhibitory interneuron in the IIIrd nucleus which finally projects to c-MR motoneurons. 4. Essentially there is no influence of the HCN stimulation on bilateral superior rectus (SR), inferior rectus (IR), superior oblique (SO) and inferior oblique (IO) motoneurons.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top