坐骨(ischium),是构成四肢動物骨盆帶的骨骼之一。
人類而言,位于骨盆下方,共有两块。坐骨骨骼坚硬,分坐骨体和坐骨支两部分。坐骨体后端的骨突称作坐骨棘(与坐骨结节不同,坐骨结节在前部)。坐骨棘的后上方为坐骨大切迹。坐骨大切迹存在性别差异,女性坐骨大切迹宽而浅。
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