髂内动脉
髂内动脉为一短干，长约4cm，于骶髂关节前方由髂总动脉分出后，斜向内下进入盆腔。其前外侧有输尿管越过，后方邻近腰骶干，髂内静脉和闭孔神经行于其内侧。主干行至坐骨大孔上缘处一般分为前、后两干，前干分支多至脏器，后干分支多至盆壁。CollateralcirculationafterinternalIIAligationasdemonstratedbyBurchell.Collateralpathwaysinclude:lumbar-iliolumbar,middlesacral-lateralsacral,andsuperior-middlerectal(hemorrhoidal)arteries.Bleich.Posteriordivisionoftheinternaliliacartery.AmJObstetGynecol.A,Internaliliacarterylength.B,Craniocaudalwidthofposteriordivisionbranch.C,Combinedlength.Bleich.Posteriordivisionoftheinternaliliacartery.AmJObstetGynecol.LeftpelvichalfofembalmedcadavershowingtheLS,SG,andILarteriesbranchingfroma
