Conception And Placentation

Question 0

Factors of FEMALE fertility

Answer 0

Number of oocyte
Age 
BMI AND BF%
Environment
Disease

Question 1

What are the events that must take place for conception to occur

Answer 1

Ovulation and transport of oocyte >
coitus >
transportation and capacitation of spermatozoa >
completion of meiosis II of the oocyte

Question 2

Factors of MALE fertility

Answer 2

Age (sperm quality and amount)
Sperm concentration
Sperm mobility

Question 3

Outline events of early embryology

Answer 3

• Sperm capacitates and erodes through CORONA RADIATA and ZONA PELLUCIDA >
• oocyte completes meiosis and male and female pronuclei join to form zygote
• zygote undergoes CLEAVAGE until it creates a MORULA
• morula enters uterus and receives uterine secretions creating fluid Antrum and becomes BLASTOCYST
• blastocyst: INNER CELL MASS & TROPHOBLAST

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Question 4

Implantation process: trophoblast:

Answer 4

• Trophoblast differentiates in to: SYNSYTIOTROPHOBLAST & CYTOTROPHOBLAST

Question 5

Implantation: syncytiotrophoblast

Answer 5

• syncytiotrophoblast: erodes endometrium and create lucanae which merge to form intervillous space to fill with maternal blood.

Question 6

Implantation: CYTOTROPHOBLAST

Answer 6

• CYTOTROPHOBLAST: develops in to chorion and amnion. Extensions of the chorion (chorionic villi) develop bathed in maternal blood in IV space

Question 7

Implantation: Decidua

Answer 7

• endometrium surrounding the blastocyst becomes the decidua:
  DECIDUA BASALIS forms on maternal side of placenta and is what chorionic villi anchor to
  DECIDUA CAPSULARIS covers the blastocyst as it enters the uterine cavity, will eventually degenerate

Question 8

Placentation: syncityotrophoblasts

Answer 8

Erode spiral arteries allowing maternal blood to fill lucanae/intervillous space

Question 9

Placentation: chorionic villi

Answer 9

Develop within intervillous space and anchor to decidua basalis

Foetal blood vessels develop within chorionic villi

Question 10

Functions of placenta

Answer 10

Transportation
Immunological
Hormone synthesis
Metabolism

Question 11

Factors necessary for the establishment of pregnancy (3)

Answer 11

Cells of zygote and blastocyst must be well nourished

Implantation must occur in endometrium of uterus

Corpus luteum must be maintained