Fetus, Placenta, Membranes And Amniotic Fluid Flashcards
The first step of Conception is Gametogenesis, which consists of which 2 things
Spermatogenesis and Oogenesis
In spermatogenesis, how long does Spermatogonia take to develop into a mature sperm?
75 days
In spermatogenesis, how long total does it take for mature sperm, including storage
90 days
Fertilization takes place in which part of the fallopian tube?
Ampullary part.
What is Cleavage
The mitotic division of the zygote
The division in cleavage, produces multiple cells until the 4th day post fertilization, what is the resultant cluster of cells called?
A morula
The division in cleavage produces multiple cells, these are called what? Individually
Blastomeres
On the 5th day post fertilization, a fluid structure is formed, what is it called?
A blastocyst
The Blastocyst has an outer and inner cell mass, what is the outer called?
Trophectoderm
What is the inner cell mass of the blastocyst?
The future embryo
The expanding blastocyst, eventually hatches from its degenerative cover called the…
Zona pellucida
Implantation occurs on which day and where
6th day, anterior or posterior wall of the body.
In implantation, the blastocyst’s outer call mass (Trophoblast) becomes what?
The placenta and chorion
In implantation, the inner cell mass (Embryoblast) becomes what?
The embryo and umbilical cord
The stages of Implantation are 4. What are all of them called
Hatching, Apposition, Adhesion, Invasion.
What is Decidualization
The changes that happen in the endometrium to form the decidual lining, in which the blastocyst implants
What part of the Desidua covers the embryo, protecting it from the uterine cavity
Desidua capsularis
Which part of the desidua is directly beneath the embryo, and forms maternal part of the placenta?
Desidua basalis
The Trophoectoderm is further differentiated into what
syncitiotrophoblast and cytotrophoblast
Explain the arterial circulation of the placenta
120-200 spiral arteries open into the intervillous space
Cytotrophoblast invasion happens in which time frame
Before 12 weeks of pregnancy (First wave of trophoblastic invasion)
The spiral arteries feeding into the placenta are the terminal branches of which artery?
Uterine artery
