| 词汇 | placentation |
| 释义 | placentation noun[ U ] uk /ˌplæs.ənˈteɪ.ʃən/ us /ˌplæs.ənˈteɪ.ʃən/ anatomy specialized the development or structure of a placenta(= the temporary organ that feeds a developing baby before it is born), or the way it is joined to the uterus(= the organ in the body of a woman or other female mammal in which a baby develops): Folic acid may improve early placentation. Previous caesarean section may increase a risk of abnormal placentation in the future. biology specialized the way in which plant ovules(= female cells that develop into seeds) are joined to the ovary(= the part of a plant that produces seeds): The arrangement of ovules is termed placentation, and is an important diagnostic character in many plants. There can be five types of placentation in plants. Poor early placentation is especially associated with early onset disease. Defects in the process of placentation precede several disorders of pregnancy, including preeclampsia. In twin pregnancies, there are two types of placentation, dichorionic and monochorionic. Obstetrics: pregnancy amnio antenatally anti-abortion artificial insemination baby brain baby bump baby weight bun expectant in vitro fertilization lactate maternity maternity leave parental leave post-conception preeclampsia preggers prenatally preterm umbilical cord You can also find related words, phrases, and synonyms in the topics: Sexual & reproductive organs Plant reproduction Examples of placentationplacentation Therefore, understanding placentation and the unique primate features may be key to understanding preeclampsia. In ninety-six there was a major fault in placentation. Placentation is initiated when the blastocyst makes contact with the epithelial lining of the uterine mucosa leading to a series of events known as implantation. Understanding the molecular underpinnings of normal placentation is important because disruptions in this process are associated with pregnancy complications. This is achieved by invasion of the walls of the maternal uterine spiral arteries by endovascular trophoblasts and is an essential step in successful placentation. These rates were significantly different and suggested both zygosity and placentation had a role in early delivery. When the placentation is dichorionic, separate fetal placental circulations are maintained whether the placentae are fused or separate. Whether the primary problem is one of inadequate placentation,39 or whether this is a secondary event,14 is still debated. This could contribute to the underlying mechanism for abnormal placentation. The two stage model as proposed does not specifically outline a mechanism through which placentation is disturbed. In this review, we first introduce the anatomy of placentation and describe the composition of the placental immune-cell infiltrate. Abnormal placentation is viewed as the starting point of disease but the proposed pathway must have antecedent elements to constitute a complete pathophysiologic sequence. Partial splitting of the zygote between day 13 and 16 will result in conjoined twins with monochorionic and monoamniotic placentation. Abnormal placentation with reduced uteroplacental perfusion might lead to intrauterine growth restriction. Many features of early placentation and the primary factors controlling the interaction of invading trophoblast with the maternal uterine vasculature leading to adequate utero-placental perfusion remain unknown. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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