Vestibulospinal control of reflex and voluntary head movement.
Vestibulospinal control of reflex and voluntary head movement.
复制标题
前庭脊髓反射和自主头部运动的控制。
DOI：
10.1111/j.1749-6632.2001.tb03760.x
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发表时间：
2001
影响因子：
5.2
通讯作者：
Boyle,R
中科院分区：
文献类型：
--
作者：
Boyle,R
摘要：与前庭神经管相关的次级前庭脊髓神经元对外加的头部运动以放电频率调制的形式做出反应，这种调制编码了运动的角速度，并在很大程度上反映了由半规管传入神经携带的输入“空间头部速度”信号。除了头部速度信号，前庭脊髓神经元还可以携带经过更多处理的信号，包括眼睛位置或眼睛速度，或两者都有(见参考文献Boyle1)。为了了解中央前庭通路在产生反射性头部稳定(如前庭结肠反射(VCR))和维持头部姿势中使用的控制信号，直接记录警觉动物中投射到颈椎节段的前庭脊髓神经元是必要的。本报告讨论了灵长类前庭脊髓系统的两个关键特征。首先描述了脊髓颈段前庭脊髓轴突的终末形态，为前庭脊髓控制头/颈姿势和运动奠定了结构基础。第二，在VCR的实际执行过程中以及在自身产生或主动的快速头部运动期间，同一类次级前庭脊髓神经元携带的头部运动信号内容被呈现出来。
Abstract:Secondary canal‐related vestibulospinal neurons respond to an externally applied movement of the head in the form of a firing rate modulation that encodes the angular velocity of the movement, and reflects in large part the input “head velocity in space” signal carried by the semicircular canal afferents. In addition to the head velocity signal, the vestibulospinal neurons can carry a more processed signal that includes eye position or eye velocity, or both (see Boyle1 on ref. list).To understand the control signals used by the central vestibular pathways in the generation of reflex head stabilization, such as the vestibulocollic reflex (VCR), and the maintenance of head posture, it is essential to record directly from identified vestibulospinal neurons projecting to the cervical spinal segments in the alert animal. The present report discusses two key features of the primate vestibulospinal system. First, the termination morphology of vestibulospinal axons in the cervical segments of the spinal cord is described to lay the structural basis of vestibulospinal control of head/neck posture and movement. And second, the head movement signal content carried by the same class of secondary vestibulospinal neurons during the actual execution of the VCR and during self‐generated, or active, rapid head movements is presented.