… The frequency of multiple births varies depending on region, race, maternal age, number of births, genetic background, etc., but it is generally considered to be approximately 1/80 n -1 for n fetuses. Gonadotropin, secreted from the pituitary gland, is effective for some women with anovulatory infertility, but since it acts directly on the follicles, it often induces multiple ovulations (superovulation or hyperovulation). The majority of quintuplets that have been the subject of recent news in Japan and overseas have been caused by ovulation induction using gonadotropin. … *Some of the terminology that refers to "superovulation" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 多胎の頻度は,地域,人種や母体の年齢,分娩回数,遺伝的背景などにより異なるが,一般的にはn胎の場合,1/80n-1にほぼ近似とされる。脳下垂体から分泌される生殖腺刺激ホルモン(ゴナドトロピン)は,ある種の無排卵性の不妊症婦人に有効であるが,卵胞に直接作用するところから複数個の排卵(過剰排卵または過排卵)を誘発することが少なくない。最近,諸外国や日本で話題となった五つ子の大半は,このゴナドトロピンによる排卵誘発によって起こっている。… ※「過排卵」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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