- urinary bladder - a membranous sac for temporary retention of urine
--1 is a kind of bladder, vesica
--1 is a part of
--1 has parts: bladder sphincter, musculus sphincter vesicaeurinary tract; urogenital system, urogenital apparatus, urinary system, urinary apparatus, genitourinary system, genitourinary apparatus, systema urogenitale, apparatus urogenitalis