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【单选题】
关于齿状线的解剖特点,下列错误的是
A.
齿状线以上是直肠上下动脉供应;齿状线以下是肛管动脉供应
B.
齿状线以上的直肠上静脉通过直肠上静脉回流入门静脉;齿状线以下的直肠下静脉由肛管静脉回流入下腔静脉
C.
齿状线以上是黏膜,由自主神经控制,无痛觉
D.
齿状线以上的淋巴回流主要至腹股沟淋巴结
E.
齿状线以下至肛缘为解剖性肛管,长3~4cm
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