2.膀胱和尿道的发生 1)尿生殖窦(上段)→膀胱→尖与尿囊相通 (以后闭锁) Allantois Urinary bladder Urachus Prostate gland Pelvic Ureter Seminal part of Prostatic and vesicle urogenital membranous sInus Seminal urethra Ductus vesicle deferens Def urogenital Penile urethra sInus Anorectal canal B2. 膀胱和尿道的发生 1) 尿生殖窦 (上段) → 膀胱 → 尖与尿囊相通 (以后闭锁)