Kromer P
Department of Anatomy, University School of Medical Sciences, Poznań.
Folia Morphol (Warsz). 1999;58(1):53-63.
Study was carried out on serial section of 45 human embryos of stages 13 to 23. The urorectal septum develops from three folds: single superior and two lateral ones. Development of the urorectal septum begins at stage 13 when the superior fold between the hindgut and allontois appears. At stage 15, all three folds unite to from complete septum, reaching the cloacal membrane and dividing the cloaca into anterior compartment, the primary urogenital sinus and the posterior compartment rectum.
对45个13至23期人类胚胎的连续切片进行了研究。尿直肠隔由三个褶皱发育而来：单个的上褶皱和两个侧褶皱。尿直肠隔的发育始于第13期，此时后肠与尿囊之间出现上褶皱。在第15期，所有三个褶皱融合形成完整的隔膜，到达泄殖腔膜并将泄殖腔分为前部的原始泌尿生殖窦和后部的直肠。
