…When the size of the pelvis and the fetal head are disproportionate during childbirth, the pubic symphysis may be torn, and in the past, surgery was performed to cut the pubic symphysis and aid in childbirth. The ischium (os ischii) is located at the lower back and is in contact with the surface of a chair when sitting on it, hence the name. Between the pubic bone and the ischium is the obturator foramen, which is naturally covered by a thin membrane of connective tissue called the obturator membrane. … *Some of the terminology that mentions "os ischii" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…分娩の際に骨盤の大きさと児頭とが不均衡な場合に恥骨結合断裂がおこることがあり,またかつては手術によって恥骨結合切開をおこなって分娩を助けてやることもあった。坐骨os ischii(ischium)は後下部にあり,いすにすわる場合にいすの面に接するので,この名がある。恥骨と坐骨との間には閉鎖孔があり,自然体では閉鎖膜という薄い結合組織の膜が張っている。… ※「os ischii」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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