兜圈征(“Round the Houses” sign)指眼球无法完成沿中线的垂直扫视。其上下运动需转至外侧形成倾斜弧度,走形呈曲线形轨迹,而非直接↑↓。该体征可能是因内侧纵束喙侧间质核(rostral interstitial nucleus of the medial longitudinal fasciculus,riMLF)严重的细胞缺失或功能障碍所致。riMLF内的神经元主要负责触发垂直扫视,而脑桥旁正中网状结构所含神经元主要形成水平扫视。
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