Weeks 1-3 Development 9/6
1. gametogenesis: formation of gametes (oocytes and sperm) where chromosome number is cut in half
2. spermatogenesis: begins at puberty
3. oogenesis: begins before birth, halts, continues at puberty
4. chromosomal anomalies and spontaneous abortions: 1/3 of all conceptions abort spon-
taneously
40-50% of those are caused by chromosomal anomalies
5. Overview of 3 phases of fertilizaiton: 1. penetration of corona radiata
2. penetration of the zona pellucida
3. fusion of the sperm and oocyte cell membranes
6. what reaction occrus when sperm penetrates the zona pellucida: it becomes
impermeable to other sperm
7. where does zygote cleveage begin: fallopian tube
8. what does zygote become 30 hours after fertilization: blastomeres
1/3
, 9. when does morula form: 3-4 days later; 12-32 cell stage
10. what do blastomeres begin to organize into: inter cell mass (embryo proper) and outer cell
mass (primary source of fetal component of the placenta
11. when is a blastocyst: comes after morula
12. what does inner cell of blastomere become: embryoblast on embyronic pole side of blastocyst
13. what does outer cell mass become: trophoblast on the abembryonic pole of blastocyst
14. what is blastocyst filled with: blastocyst cavity
15. what does a trophoblast consist of: cytotrophoblast and syncytiotrophoblast
16. syncytiotrophoblast: cells directly embedded int o the endometrium
17. where does an ectopic pregnancy typically implant: uterine tubes
abdomen
surface of ovary
within ova duct
abnormal sit in uterus
2/3
1. gametogenesis: formation of gametes (oocytes and sperm) where chromosome number is cut in half
2. spermatogenesis: begins at puberty
3. oogenesis: begins before birth, halts, continues at puberty
4. chromosomal anomalies and spontaneous abortions: 1/3 of all conceptions abort spon-
taneously
40-50% of those are caused by chromosomal anomalies
5. Overview of 3 phases of fertilizaiton: 1. penetration of corona radiata
2. penetration of the zona pellucida
3. fusion of the sperm and oocyte cell membranes
6. what reaction occrus when sperm penetrates the zona pellucida: it becomes
impermeable to other sperm
7. where does zygote cleveage begin: fallopian tube
8. what does zygote become 30 hours after fertilization: blastomeres
1/3
, 9. when does morula form: 3-4 days later; 12-32 cell stage
10. what do blastomeres begin to organize into: inter cell mass (embryo proper) and outer cell
mass (primary source of fetal component of the placenta
11. when is a blastocyst: comes after morula
12. what does inner cell of blastomere become: embryoblast on embyronic pole side of blastocyst
13. what does outer cell mass become: trophoblast on the abembryonic pole of blastocyst
14. what is blastocyst filled with: blastocyst cavity
15. what does a trophoblast consist of: cytotrophoblast and syncytiotrophoblast
16. syncytiotrophoblast: cells directly embedded int o the endometrium
17. where does an ectopic pregnancy typically implant: uterine tubes
abdomen
surface of ovary
within ova duct
abnormal sit in uterus
2/3
