一个半综合征(以下简写1~1/2症群)是一种眼外肌运动的临床障碍,其特征为向一个方向的侧视麻痹,伴以向另一方向的核间性眼肌麻痹(简写INO)。此综合征的完全型为一眼固定于中线,所有侧视运动消失;另一眼仅能外展,并于外展时表现水平性急动性眼震。此综合征常由一侧脑桥被盖下部受损, One and a half syndromes (hereinafter referred to as 1 to 1/2 syndrome) is a clinical disorder of extraocular muscle movement characterized by lateral paralysis in one direction accompanied by paralysis of the intercostal ophthalmoplegia in the other direction (Abbreviated INO). The complete type of this syndrome is a fixed in the midline, all lateral motion disappeared; the other can only be abducted, and in the abduction showed horizontal acute nystagmus. This syndrome is often covered by the lower part of the pons side of the brain damage,