Eye Movement–Related Activity in the Vestibulo-ocular and Vestibulocollic Pathways in the Cat
Eye Movement–Related Activity in the Vestibulo-ocular and Vestibulocollic Pathways in the Cat
In recent years, the vestibular system has been implicated not only in the reflex movements produced by labyrinthine inputs but also in the control of active motor behaviors, especially eye and head movements during gaze. This chapter discusses the experimental proof pertaining to the functional organization of vestibulo-ocular and vestibulo-oculo-collic pathways, with focus on recent researches of the signals carried by secondary vestibular neurons on the vertical canal systems. The synaptic organization of the vestibulo-ocular reflex (VOR) and vestibulocollic reflex (VCR) pathways stemming from the semicircular canals have been extensively studied and the fundamental patterns of excitatory and inhibitory connections with specific canal-muscles relationships have been well established. Although excitatory connections from the anterior involve the pathways through the deep reticular formations in the cat, the major part of the excitatory pathways ascend in the contralateral medial longitudinal fasciculus (MLF), and the inhibitory pathways in the ipsilateral MLF.
Keywords: vestibular system, vestibulo-ocular pathways, vestibulo-oculo-collic pathways, vestibulo-ocular reflex, vestibulocollic reflex, inhibitory pathways
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