【单选题】【消耗次数：1】
神经元的轴突内缺少（）
①
神经丝
②
微管
③
微丝
④
滑面内质网
⑤
尼氏体
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神经元的轴突和树突在形态结构上最主要的不同点是（）
①
树突有分支，而轴突没有分支
②
树突直径粗细均匀，而轴突直径则粗细不均
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轴浆内有神经原纤维，而树突的细胞质内则没有神经原纤维
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树突分支多，而轴突没有分支
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分胞体和突起两部分
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胞体由胞核、胞质和胞膜组成
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树突内无尼氏体
⑤
神经元的突起彼此以突触相互连接，形成神经通路和网络
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