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    耳蜗管 cochlear duct，cochlear canal

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    816
    为由骨迷路中膜迷路部的球形囊的基础部（Parsbasilaris）分化的。在爬行类以上的动物，已伸长成为盲管状。哺乳类最发达，围绕中轴3—5回回旋的螺旋状构造，是司膜迷路的听觉部分。这种螺旋的回数，因动物种类不同而异，不具多大意义，作用反不如基底膜长度重要，它标志着可听范围的大小。其断面大致呈三角形，里面充满内淋巴，在接近前庭部分，通过纤细的结合管（canalis reuniens）与球形囊相通。耳蜗管的上部，通过前庭膜与前庭阶相对，在外侧由血管条与骨迷路相接，下方以基底膜与鼓室阶相对。前庭膜是内皮和单层的扁平上皮相贴着的结缔组织性的薄膜。在血管条内有富有血管的结缔组织，以资分泌内淋巴。内淋巴和外淋巴的离子成分，越是高等动物，其差别越大，这种血管条，可主动进行传输，据称这部分是耳蜗内电位源。

     

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