« EMBRYONIC AND PLACENTAL DEVELOPMENT EARLY BLASTOCYSTS In a description of the earliest stages of the human blastocyst, the wall of the primitive blastodermic ...» Document abstract
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SummaryIn a description of the earliest stages of the human blastocyst, the wall of the primitive blastodermic vesicle was characterized as consisting of a single layer of ectoderm. As early as 72 hours after ovum fertilization, the 58-cell blastula had differentiated into 5 embryo-producing cells and 53 cells destined to form trophoblasts (Hertig, 1962). Although trophoblasts have not been distinguished before blastocyst implantation, both cytotrophoblasts and syncy-tiotrophoblast are present in the earliest implanted blastocyst of the monkey. Indeed, evidence has been presented that chorionic gonadotropin (hCG) is secreted by cells of the human blastocyst at the time of implantation.
Table of Contents- EARLY BLASTOCYSTS
- EMBRYONIC DEVELOPMENT AFTER IMPLANTATION
- CYTOTROPHOBLAST INVASION OF DECIDUAL VESSELS
- GERM LAYERS
«EARLY HUMAN DEVELOPMENT . The extravillous and villous trophoblasts are the embryonic-fetal tissues of the anatomical interface of the placental arm; the ...» Document abstract
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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
« also are likely derived from embryonic mesoderm Simultaneously with growth and development, interstitial collagens Placental amnion covers the fetal surface of ...» Document abstract
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Language : english
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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.
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