cloacal

Results In normal fetus, the urorectal septum ( URS ) descended, its distance to cloacal membrane decreased gradually.

结果　泄殖腔发育过程中,胎龄15d前 的正常鼠胚, 尿直肠隔将 泄殖腔 分为腹侧的尿生殖窦和背侧的直肠两部分, 二者共同相通于泄殖腔管.

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