Lecture 3 Flashcards
Conception is with
2nd degree oocyte (mature ovum) + spermatozoon
Conception occurs ___ - _____ hours of ovulation
24-36
Best days of cycle for conception
14 to 15
Conception forms
A single cell zygote
Conception occurs within the ______ region of fallopian tube
Ampullary
Zygote has how many chromosomes
46
Diploid number
Explain the chromosome breakdown
22 autosomal and 1 pair of ssex chromosomes
Each parent contributes ____ chromosomes
23
The conceptus is developing as it travels through
Fallopian tube
Cleavage
Zygot rapidly divides, each division cells double and become smaller
Size of zygote =
Size of morula
What is morula
12-15 cells
Morula will develop a fluid filled cavity call
Blastocyst cavity or blastocele
The conceptus at day 5 is called
Blastocyst
Blastocyst aka
Blastula
3 distinct parts of the blastocyst
Trophoblast
Embryoblast/ ICM
Blastocele
What does trophoblast do
Makes future placenta (embryonic part)
Produces HCG that supports CL
What does Embryoblast/ICM do
Will develop into embryo
What is Blastocele
Fluid filled cavity
Blastocyst implants on day ___-___ of lmp
20-23
Blastocyst impplants how many days after fertilization
5
What will the amniotic cavity do
Will house the pregnancy within the gestational sac
What will chorion develop into
Placenta
What does yolk sac provide
Nutrient to the developing fetus
Gastrulation is how many germ layers
3 germ cell layers
What is the decidua
Endometrium during pregnancy
What is decidual reaction
The changes that occur to the endometrium
What is decidual reaction due to
Estrogen and progesterone from CL
Is decidua always due to intrauterine pregnancy
No
Decidualized endometrium has hat 3 layers
Decidua basalis
Decidua capsularis
Decidua Parietalis/vera
Decidua basalis aka
Decidual plate
Decidua basalis is site of ______ attachment
Blastocyst
Decidua basalis will develop into ________
Maternal portion of placenta
Decidua capsularis covers ________
Covers the blastocyst and seperates it from the endometrial cavity
Decidua parietalis/ vera
Remainder of endometrium not directly in contact with the blasatocyst
Implantation of the blastocyst can take up to _____ days
4
During implantation the embyroblast (inner cell mass) develops into
Bilaminar embryonic disc and amniotic cavity
