The syncytiotrophoblast, the outermost layer of the human placenta, is the main site of exchange for drugs and metabolites, nutrients, waste products, and gases between the maternal and fetal circulations.
Why does syncytiotrophoblast invades the endometrial lining of the uterus?
Syncytiotrophoblast (from the Greek ‘syn’- “together”; ‘cytio’- “of cells”; ‘tropho’- “nutrition”; ‘blast’- “bud”) is the epithelial covering of the highly vascular embryonic placental villi, which invades the wall of the uterus to establish nutrient circulation between the embryo and the mother.
When is syncytiotrophoblast formed?
Free blastocyst (following the dissolution of the pellucid zone) in adplantation phase on the uterine wall (6th to 7th day). The trophoblast cells of the embryonic pole differentiate themselves, multiply, and form the invasive syncytiotrophoblast.
Does the syncytiotrophoblast become the placenta?
The villous syncytiotrophoblast makes the majority of the placental hormones, the most studied being hCG.
What does the Cytotrophoblast do?
The primary function of an interstitial cytotrophoblast is to anchor the growing fetus to the maternal uterine tissue. These cells may invade the whole endometrium and the proximal third of the myometrium.
Does syncytiotrophoblast produce progesterone?
The syncytiotrophoblast produces both protein and steroid hormones which are released into the maternal blood (M). Beginning at about eight weeks of gestation, the syncytiotrophoblast assumes the role of the corpus luteum and begins to secrete the steroid hormones, estrogen and progesterone.
What does the cytotrophoblast do?
What does the syncytiotrophoblast produce?
The syncytiotrophoblast produces both protein and steroid hormones which are released into the maternal blood (M). Human chorionic gonadotrophin (hCG) is aglycoprotein hormone synthesized in the rough ER (arows) of syncytiotrophoblasts immediately after implantation of the blastocyst into the uterine wall.
What is syncytiotrophoblast and cytotrophoblast?
The syncytiotrophoblast is a rapidly growing multinucleated mass, which invades and ruptures endometrial capillaries forming lacunae. The cytotrophoblast is a layer of mononucleated cells, which invades the syncytiotrophoblast matrix and forms early chorionic villi.
Does cytotrophoblast produce hCG?
Cytotrophoblast cells naturally produce hyperglycosylated hCG, which promotes their growth and invasion. Other cells need to be transformed to produce invasive hyperglycosylated hCG.
Where is myometrium located in the uterus?
The myometrium (Pic. 2) is located between the endometrium (the inner layer of the uterine wall) (Pic. 3), and the serosa or perimetrium (the outer uterine layer).
What is the pathophysiology of myometrium development?
As for the pathogenesis of the development of myometrium, it all begins with the entry of the pathogen into the myometrium, which most often occurs in an ascending manner.
What is the structure of the smooth muscle of the myometrium?
The smooth muscle of the myometrium is basically very similar in molecular structure to smooth muscle in other sites of the body, with myosin and actin being the predominant proteins expressed. In uterine smooth muscle, there is approximately 6-fold more actin than myosin.
What happens to the myometrium after delivery?
After delivery the myometrium contracts to expel the placenta and reduce blood loss; where the crisscrossing fibres of middle layer compress the blood vessels. Thus a positive benefit to early breast feeding is a natural stimulation of this reflex to reduce blood loss and facilitate a swift return to prepregnancy uterine and abdominal muscle tone.
