由第三脑室侧壁的背侧向腹侧过渡，纤毛密度逐渐增加。
From the dorsal of lateral wall of the third ventricle to the ventral, the density of cilia increase gradually.
纤毛或鞭毛从 细胞表面的基体出生长，双微管的动力蛋白臂从一侧延伸到另一侧而引起运动。
Movement is based on the activities of tiny dynein side arms that extend from one of the microtubules of each doublet.
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