urinary bladder 膀胱 A saccular organ in which urine accumulates before discharge from the body. [Bemis_WE, Functional_Anatomy_of_the_Vertebrates:_An_Evolutionary_Perspective, Glossary_G-29, Grande_L, Liem_KF, Third_Edition_(2001)_Orlando_Fla.:_Harcourt_College_Publishers, Walker_WF][VHOG] AAO:0000623 Anatomical structure which consists of a membranous sac used to temporarily store urine until it is excreted from the body.[AAO] BTO:0001418 CALOHA:TS-1090 EFO:0000290 EHDAA2:0000174 EHDAA:9328 EMAPA:18321 EV:0100098 FMA:15900 GAID:0000004 In tetrapods, the urinary bladder arises as an outpocketing of the cloaca. (...) The tetrapod urinary bladder appears first among amphibians and is present in Sphenodon, turtles, most lizards, ostriches among birds, and all mammals.[well established][VHOG] MA:0000380 MAT:0000122 MESH:A05.810.161 MIAA:0000122 OpenCyc:Mx4rvVjMmZwpEbGdrcN5Y29ycA The urinary bladder evolved in tetrapods. Birds to not possess a true urinary bladder, although Palaeognathae have an undifferentiated cloacal outpocketing that serves a similar function[https://github.com/obophenotype/uberon/issues/454] UBERON:0001255 UMLS:C0005682 VHOG:0000740 XAO:0000154 bladder distensible musculomembranous organ situated in the anterior part of the pelvic cavity in which urine collects before excretion[MP]. galen:UrinaryBladder uberon urocyst vesica vesica urinaria vesical 从体内排出前尿液积聚的囊状器官。[Bemis_WE, Functional_Anatomy_of_the_Vertebrates:_An_Evolutionary_Perspective, Glossary_G-29, Grande_L, Liem_KF, Third_Edition_(2001)_Orlando_Fla.:_Harcourt_College_Publishers, Walker_WF][VHOG] 位于盆腔前部的可扩张的肌膜器官，其中尿液在排泄前收集[MP]。 在四足动物中，膀胱以泄殖腔的形式出现。（...）四足膀胱最早出现在两栖动物中，存在于斯芬克顿、海龟、大多数蜥蜴、鸟类中的鸵鸟和所有哺乳动物中。[well established][VHOG] 膀胱 膀胱 膀胱(urocyst) 膀胱(vesica urinaria) 膀胱(vesica) 膀胱由四足动物进化而来。鸟类不能拥有真正的膀胱，尽管古颔类有一个无分化的泄殖腔，它具有类似的功能[https://github.com/obphenotype/uberon/disonts/454] 解剖结构，由膜囊组成，用于暂时储存尿液，直到尿液从体内排出。 viscus 腑脏 mesoderm-derived structure 中胚层衍生结构 bladder organ 膀胱器官