This refers to a state in which both eyes remain facing in one direction. This can be either horizontal or vertical. Eye movement to the left and right (horizontal conjugate deviation) is controlled by neural circuits from the cerebral cortex to the pons and the horizontal conjugate deviation center in the pons, but if a lesion occurs anywhere in these pathways, horizontal conjugate deviation in a fixed direction becomes impossible, and the eyes remain pulled to the opposite side. This condition is called paralytic conjugate deviation. Lesions in the cerebral hemispheres, such as stroke, can cause this type of paralytic conjugate deviation, and the eyes often assume a position in which they are glaring toward the side with the lesion. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
左右の眼球が一方向を向いたままの状態にあることをいう。水平方向のものと垂直方向のものとがある。左右の方向への眼球運動(水平共同視)は,大脳皮質から橋(きよう)への神経回路と,橋にある水平共同視中枢によって営まれているが,これらの経路のどこかに病変が生ずると,一定方向への水平共同視ができなくなり,眼球はそれと反対側にひかれた状態のままとなってしまう。このような状態が麻痺性の共同偏視である。脳卒中などのように大脳半球内の病変では,このような麻痺性共同偏視を生じ,眼球は病変のある側をにらむような位置をとることが多い。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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