«STRUCTURE . DEVELOPMENT . AMNION CELL HISTOGENESIS . AMNION EPITHELIAL CELLS. . AMNION MESENCHYMAL CELLS.. ANATOMY . TENSILE STRENGTH . ...» Document abstract
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SummaryThe amnion at term is a tough and tenacious but pliable membrane. It is the innermost fetal membrane and is contiguous with the aminonic fluid. This particular avascular structure occupies a role of incredible importance in human pregnancy. In many obstetrical populations, preterm premature rupture of the fetal membranes is the single most common antecedent of preterm delivery. The amnion is the tissue that provides almost all of the tensile strength of the fetal membranes. Therefore, the development of the component(s) of the amnion that protects against rupture or tearing is vitally important to successful pregnancy outcome.
Table of Contents- STRUCTURE
- DEVELOPMENT
- AMNION CELL HISTOGENESIS
- AMNION EPITHELIAL CELLS.
- AMNION MESENCHYMAL CELLS.
- ANATOMY
- TENSILE STRENGTH
- INTERSTITIAL COLLAGENS.
- COLLAGEN SYNTHESIS IN AMNION.
- VASOACTIVE PEPTIDES.
- AMNIONIC FLUID.
« laeve. The chorion laeve is generally more nearly translucent than the amnion even though rarely exceeding 1 mm in thickness. The ...» Document abstract
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SummaryFrom the electron microscopic studies of Wislocki and Dempsey (1955), data were provided that permitted a functional interpretation of the fine structure of the placenta. There are prominent microvilli on the syncytial surface, corresponding to the "brush border" described by light microscopy. Associated pinocytotic vacuoles and vesicles are related to the absorptive and secretory placental functions. The inner layer of the villi—the cytotrophoblasts—persists to term, although often compressed against the trophoblastic basal lamina, and retains its ultrastructural simplicity.
Table of Contents- TROPHOBLAST ULTRASTRUCTURE
- PLACENTAL COTYLEDONS
- BREAKS IN THE PLACENTAL "BARRIER"
- PLACENTAL SIZE AND WEIGHT
- PLACENTAL AGING
« The fetal surface of the placenta is covered by the transparent amnion beneath which the fetal chorionic vessels course. A section ...» Document abstract
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Language : english
medical studies
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26/11/2007
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SummaryBecause the placenta functionally represents a rather intimate association of the fetal capillary bed to maternal blood, its gross anatomy primarily concerns vascular relations. The fetal surface of the placenta is covered by the transparent amnion beneath which the fetal chorionic vessels course. A section through the placenta in situ includes amnion, chorion, chorionic villi and intervillous spaces, decidual plate, and myometrium. The maternal surface of the placenta is divided into irregular lobes by furrows produced by septa, which consist of fibrous tissue with sparse vessels confined mainly to their bases. The broad-based septa ordinarily do not reach the chorionic plate, thus providing only incomplete partitions.
Table of Contents- FETAL CIRCULATION
- MATERNAL CIRCULATION
- Ramsey and Donner (1980) presented a summary of anatomical studies of the uteroplacental vasculature.
« and villous trophoblasts are the embryonic-fetal tissues of the anatomical interface of the placental arm; the avascular fetal membranes-the amnion and chorion ...» Document abstract
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Language : english
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SummaryThe extravillous and villous trophoblasts are the embryonic-fetal tissues of the anatomical interface of the placental arm; the avascular fetal membranes—the amnion and chorion laeve—are the fetal tissues of the anatomical interface of the paracrine arm of this system.
The placental arm of this system links the mother and fetus as follows: maternal blood (spurting out of the uteroplacental vessels) directly bathes the syncytiotrophoblast, the outer surface of the trophoblastic villi; fetal blood is contained within fetal capillaries, which traverse within the intravillous spaces of the villi. This is a hemochorioendothelial type of placenta. The paracrine arm of this system links the mother and fetus through the anatomical and biochemical juxtaposition of (extraembryonic) chorion laeve and (maternal uterine) decidua parietalis tissue.
The placental arm of this system links the mother and fetus as follows: maternal blood (spurting out of the uteroplacental vessels) directly bathes the syncytiotrophoblast, the outer surface of the trophoblastic villi; fetal blood is contained within fetal capillaries, which traverse within the intravillous spaces of the villi. This is a hemochorioendothelial type of placenta. The paracrine arm of this system links the mother and fetus through the anatomical and biochemical juxtaposition of (extraembryonic) chorion laeve and (maternal uterine) decidua parietalis tissue.
Table of Contents- The placental arm of this system links the mother and fetus as follows: maternal blood (spurting out of the uteroplacental vessels) directly bathes the syncytiotrophoblast, the outer surface of the trophoblastic villi
- EARLY HUMAN DEVELOPMENT
- FERTILIZATION OF THE OVUM AND CLEAVAGE OF THE ZYGOTE
- THE EARLY HUMAN ZYGOTE.
- IMPLANTATION
- BIOLOGY OF THE TROPHOBLAST
- DIFFERENTIATION.
- FORMATION OF THE SYNCYTIUM
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