行直肠脱垂注射术时,为防止刺破腹膜,进针应小于:() ["4cm","5cm","6cm","8cm","10cm"]
直肠手术可以采取骶尾入路的解剖根据是:() ["直肠壶腹前壁向前膨出","直肠后壁无腹膜遮盖","直肠后壁无直肠瓣","此处组织疏松","以上均不对"]
临床上用来定位内外括约肌分界的是:() ["肛门白线","齿线","牙线","栉膜","以上均不对"]
直肠上、下静脉丛在何处互相交通:() ["齿线","栉膜带","肛门白线","肛管直肠环","以上均不对"]
齿线上的痔内静脉丛分布在何处最为显著:() ["左前、右后、左侧","右前、左前、左侧","右侧、右后、左前","右前、右后、左侧","左前、左后、右侧"]
指出图示是什么接线组别。