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....
In the cloaca there are many annular an obvious one divides anus channel and uigenita 1 sinus.泄殖腔内有明显的环褶将肛道与尿、生殖道分开.The mucous cells lie in the anterior part of the foregut and cloaca.粘液细胞分布于前肠的前段和排泄腔.Especially do not c...