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懷孕之后還有可能來月經嗎 懷孕了來月經的原因分析(2)

出處：媽媽育兒網 日期：2016-11-10 10:13:46 編輯：七七

一、月經周期

女孩子出生后，卵巢里就有許多原始卵泡。進入青春期后，一般每個月有一個卵泡發(fā)育成熟并被排出卵巢。排卵的日子大體在兩次月經中間，即下次月經的前14天左右。

在排卵以前，卵泡發(fā)育的過程中卵巢產生雌激素，子宮內膜受雌激素的影響，逐漸增厚達2毫米左右。這時候子宮內膜的腺體隨之增長，動脈加粗變彎，結締組織增生。

卵泡在破裂排出卵子以后，立即縮小，形成黃體。

黃體除了分泌雌激素外，還能分泌孕激素。在雌激素和孕激素的作用下，子宮內膜繼續(xù)增厚到5毫米左右。

子宮內膜的這種變化是為卵子受精后植入子宮做準備，如果卵子受精，受精卵就會在這松軟、肥厚、富有血管的子宮內膜上種植(著床)、子宮內膜就會繼續(xù)生長發(fā)育，同時在黃體的作用下，它不脫落，也就沒有月經。

如果卵子沒有受精，黃體就逐漸退化，分泌的雌激素、孕激素急劇減少，子宮內膜突然失去激素的作用，血管就會發(fā)生持續(xù)收縮，使子宮內膜的功能層缺血，引起組織壞死，隨后動脈擴張，使毛細血管急性充血，壞死的子宮內膜功能層就剝落下來，同血液、子宮頸分泌的粘液一起排出，這就是月經。

月經期一般是3-5天，這期間子宮內膜的功能層剝落，造成了宮內的傷創(chuàng)面，月經過后6-14天，子宮內膜的基底層上皮細胞分裂增生，移向破潰的創(chuàng)面，逐漸修復和形成新的功能層。

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