肾小管（renal tubuale）

互联网2013-11-15

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　　起于肾小囊，全长约 50～ 55毫米，依次分为近端小管、细段和远端小管。近端小管和远端小管又都分为曲部和直部。近端小管直部、细段和远端小管直部构成“ U”形髓袢，依其走行方向分为降支和升支，降支可伸入髓质，升支从髓质又进入皮质，与远端小管曲部相连，肾小管壁为单层立方上皮。肾小管除输送原尿外，还有重吸收、分泌及排泄功能，对尿的生成和浓缩起重要作用。

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