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placentation    
胎盘形成; 胎座式

胎盘形成; 胎座式

placentation
n 1: the formation of the placenta in the uterus
2: arrangement of the ovules in the placenta and of the
placentas in the ovary

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  • Placentation: Definition, Types, and Significance - Embibe
    What is placentation? Ans: The mode of arrangement of ovules within the ovary is called placentation The placenta is a tissue that develops along the inner wall of the ovary
  • Top 6 Types of Placentation (With Diagram) | Plants - Biology Discussion
    The following points highlight the top six types of placentation in a plant The types are: 1 Marginal 2 Parietal 3 Axile 4 Free-central 5 Superficial or Laminar 6 Basal Placentation in Plants: Type # 1 Marginal: The ovules develop in rows near the margin on the placenta formed along the ventral suture
  • Placentation: Videos Practice Problems - Pearson
    The placenta is a vital temporary organ formed from maternal and fetal tissues, facilitating oxygen, nutrient, and waste exchange during pregnancy It produces essential hormones like HCG, estrogen, and progesterone, supporting gestation
  • Prenatal development - Implantation, Placentation | Britannica
    Placentation The irregular strands of invasive syncytial trophoblast constitute a first stage in the formation of true villi, which form part of the placenta and are briefly described below Primitive connective tissue soon lines the interior of the blastocyst wall, and this complex of trophoblast and connective tissue is then named the chorion
  • Placentation - an overview | ScienceDirect Topics
    Placentation is an interaction between the outer membrane of the embryonic vesicle, the chorion, and the uterine lining It progresses through stages of apposition, adhesion and attachment, culminating in the development of a physical union between the embryonic membrane and the uterine lining
  • New Insights into the Process of Placentation and the Role of Oxidative . . .
    Placentation is the process of formation and development of the placenta and the associated modifications in maternal tissue Its continued interaction character, involving two distinct genomes, suggests the presence of a fine-tuned regulation
  • Placenta: Meaning, Types and Function - Zoology Notes
    The method of formation and fusion of the foetal placenta to the uterine wall is called placentation From the maternal side only a single component, the endometrium, is involved, but from the foetal side there are four prospective elements — amnion, chorion, yolk sac and allantois
  • Placenta Development – Human Reproduction: A Clinical Approach
    Gametogenesis, Fertilization, and Implantation The placenta is a vital organ for fetal development It arises from the trophoblastic layer of the blastocyst At 14 days after fertilization, the cytotrophoblast, the trophoblast layer facing the fetal side, develops the chorion layer that wraps around the baby





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