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关于骨盆的叙述，正确的是（）

单选题

2021-12-25 16:54

A、骨盆是由骶骨、尾骨及耻骨组成
B、真骨盆两侧为髂骨翼，后为第5腰椎
C、骨盆入口平面为真假骨盆的交界面，前方为耻骨联合，两侧为髂耻缘，后方为骶岬上缘
D、骨盆出口平面由两个在不同平面的三角形组成，坐骨棘间径为两个三角形共同的底
E、中骨盆平面横径为坐骨结节间径，是分娩过程中衡量胎先露下降程度的重要标志

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正确答案

试题解析

骨盆由骶骨、尾骨及左右两块髋骨组成。以耻骨联合上缘、髂耻缘及骶岬上缘的连线为界，将骨盆分为上下两部分，上方为假骨盆，下方为真骨盆。假骨盆两侧为髂骨翼，后为第5腰椎。真骨盆的上口为骨盆入口，下口为骨盆出口，骨盆出口平面由两个在不同平面的三角形组成，坐骨结节间径为两个三角形共同的底。中骨盆平面横径为坐骨棘间径，是分娩过程中衡量胎先露下降程度的重要标志。

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