placentation


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placentation

 [plas″en-ta´shun]
the series of events following implantation of the embryo and leading to development of the placenta.

plac·en·ta·tion

(plas'en-tā'shŭn),
The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta. Types of placentation are defined under placenta.

placentation

(plăs′ən-tā′shən)
n.
a. Formation of a placenta in the uterus.
b. The type or structure of a placenta.

placentation

Obstetrics The formation of the placenta in the uterus; the process by which a placenta grows and develops in the uterus. See Extrachorial placentation.

plac·en·ta·tion

(plas'en-tā'shŭn)
The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta.

placentation

the arrangement of PLACENTAS (2) in the plant ovary, which can be classified into several categories including:
  1. (a) apical, at the ovary apex,
  2. (b) basal, at the ovary base,
  3. (c) parietal, on the ovary wall,
  4. (d) free-central, on a column growing up from the ovary base.
References in periodicals archive ?
Prenatal identification of invasive placentation using ultrasound: systematic review and meta-analysis.
During current investigation level of glucose, total protein, albumin and triglyceride was significantly decreased at the end of fetal growth stage (day28) in the amniotic fluid in comparison with placentation period (day18), whereas BUN and AST levels were significantly increased during corresponding period of the flourishing pregnancy.
Placentation requires release of special MMPs, trophoblast invasion, and spiral arteries remodeling, as well as the eventual embodiment of ECM structure (3).
We hypothesised that PlGF, VEGF and sFlt-1 serum levels could be important preoperative biomarkers of PP compared to normal fundal placentation. To the best of our knowledge, no study has investigated pre- and postoperative serum VEGF, PlGF and sFlt-1 levels.
The process known as placentation is meticulously coordinated, and the equilibrium maintenance of the fetoplacental unit depends on its effective occurrence.
Changes in the nucleotide sequences in the binding sites of transcription factors or transcription repressors alter the regulation of MMP gene expression and thus may have an impact on the improper placentation of the trophoblast into the uterine wall.
A large uterine cavity pseudoaneurysm measuring 4.2 x 3.8 x 3.7 cm and appearing to arise from abnormal placentation at the previous cesarean scar was identified (Figure 1).
Some studies have suggested that the invasion process of human placentation and the behavior of trophoblast cells are similar to malignant cells, with the exception that trophoblast invasion is limited spatiotemporally by relative genes [23].
IFN[gamma] plays a role in implantation, placentation, and continuation of pregnancy [22, 35, 36].
An abnormal placentation into the uterine wall could present a risk of maternal and fetal morbidity (morbidly adherent placenta, MAP) and mortality, so it should be identified and defined early on (1, 2).
Maternal air pollution exposure may affect pregnancy by inducing oxidative stress and systemic inflammation, decreasing the degree of placental global DNA methylation, and eliciting suboptimal placentation or placental inflammation (Brook et al.