What are the stages of placental development?
The development of the placenta begins during implantation of the blastocyst. The 32-64 cell blastocyst contains two distinct differentiated embryonic cell types: the outer trophoblast cells and the inner cell mass. The trophoblast cells form the placenta. The inner cell mass forms the foetus and foetal membranes.
How is the placenta developed?
In general, once the fertilized egg implants in the uterine wall, the placenta begins forming. But the ball starts rolling several days before implantation. When you ovulate, an egg leaves the ovary to travel through the fallopian tube in hopes of being fertilized.
What is placenta and its function Slideshare?
PLACENTAL FUNCTION • Transfer of nutrients and waste products bn the mother & fetus. RESPIRATORY EXCRETORY NUTRITIVE • Produces or metabolizes the hormones & enzymes necessary to maintain the pregnancy.
What is the development of embryo and placenta?
At 8 weeks of pregnancy, the placenta and fetus have been developing for 6 weeks. The placenta forms tiny hairlike projections (villi) that extend into the wall of the uterus. Blood vessels from the embryo, which pass through the umbilical cord to the placenta, develop in the villi.
What is the structure of the placenta?
The placenta is composed of both maternal tissue and tissue derived from the embryo. The chorion is the embryonic-derived portion of the placenta. It is composed of fetal blood vessels and trophoblasts which are organized into finger-like structures called chorionic villi.
What are the layers of placenta?
Amniotic layer is composed of a single-celled epithelial layer and a deeper mesodermal layer. Chorionic layer is composed of a mesodermal layer and a trophoblast layer.
At what week is the placenta formed?
In weeks 4 to 5 of early pregnancy, the blastocyst grows and develops within the lining of the womb. The outer cells reach out to form links with the mother’s blood supply. After some time, they will form the placenta (afterbirth). The inner group of cells will develop into the embryo.
What is the main function of placenta?
The placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby’s blood.
Which of the following will develop into the placenta?
Blastocyst: The blastocyst possesses an inner cell mass from which the embryo will develop, and an outer layer of cells, called the trophoblast, which will eventually form the placenta.
How was the placenta and fetal membranes were developed?
The membrane forms by the syncytiotrophoblast, cytotrophoblast, embryonic connective tissue (Wharton’s jelly), and the endothelium of fetal blood vessels. The umbilical cord serves to attach the fetus to the placenta and consists of two umbilical arteries and one umbilical vein.
What are the 5 functions of the placenta?
The placenta is the interface between mother and fetus. Functions of the placenta include gas exchange, metabolic transfer, hormone secretion, and fetal protection. Nutrient and drug transfer across the placenta are by passive diffusion, facilitated diffusion, active transport, and pinocytosis.
What is the development of placenta?
Development of placenta. 1. PLACENTA. 2. Placenta (plah-sen’tah) is a Latin word. It means “a flat cake”. • Placenta is an organ characteristic of mammals, developing during pregnancy, joining mother and offspring, providing necessary provisions for the sustenance of developing human in intrauterine life.
What are the different types of placentae?
These placentae are called Placenta Duplex, Placenta Triplex etc. and Placenta Multiplex, as the number of lobes increase. 57. Sometimes placenta fails to develop over a small area. There are only fetal membranes in the deficient place. The deficient area appears like a window.
What are the aims of placenta study?
Aims To outline the structure of the mature placenta To outline development of the placenta elaboration of the villous trees the intrauterine environment during the first trimester establishment of the maternal circulation to the placenta To consider remodelling of the early placenta and formation of the smooth membranes
What is the placenta made of?
Internally it consists of a fetal villous tree bathed directly by maternal blood, at least during the second and third trimesters The mature human placenta 20 µm To enhance diffusional exchange a large surface area and a thin membrane between the maternal and fetal circulation is needed