cloacal造句

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.