坐骨小孔
坐骨小孔由坐骨小切迹与骶结节韧带、骶棘韧带共同围成,是臀部与坐骨肛门窝之间的通道,从外侧向内侧有阴部内动脉、阴部内静脉和阴部神经通过。坐骨肛门窝与臀部的化脓感染可通过此孔互相蔓延。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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