共同腱环(Common tendinous ring),又称津氏环(annulus of Zinn)、环状腱(annular tendon),是一个纤维组织环,位于眼眶底部入口处,环绕出眼球的视神经。它是眼外肌肉中四条直肌的共同起点。依照眶上裂(superior orbital fissure)通过的位置,可以将共同腱环分隔成两区。上腱有上、内、外直肌附着,下腱则有下、外直肌附着。[1][2]
邻近共同腱环处,有环绕视神经的动脉,动脉形成管状结构,称为Zinn-Haller圈,又称津氏圈(circle of Zinn)。[3]
以下列出穿过共同腱环的构造,由上而下依序是:
参考资料
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