髓放线内有近端小管直部和远端小管直部。
The medullary ray contains the straight parts of proximal tubules and distal tubules.
集合管、近端、远端小管均可见明、暗两种类型上皮细胞。
The light cells and dark cells can be observed in the collecting, proximal and distal tubule.
胚胎第8周近、远端小管已形成，第10周已有小管发育较好。
During the 8 weeks, the proximal and distal tubule had formed and the tubule had developed well during the 10 weeks.
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