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27 Cards in this Set
- Front
- Back
Embryological Stages |
•Zygote •Morula Stage •Blastocyst Stage • 3 Week Embryo/Neurola • One month embryo |
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Embryological Events/processes |
• Penetration • Ferttilization • Cleavage • Differentiation • Implantation • Gastrulation • Organogenesis |
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Penetration/fertilization occurs in fallopian tube __ - ____ hours after ovulation |
12-24 |
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Penetration of sperm stimulates... |
•Ca2+ release (prevents 2nd penetration) •Secondary oocyte completes meiosis II to become ovum |
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Fertilized ovum called... |
Zygote Stage |
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The zygote (after fertilization) undergoes the cleavage process to become a..... |
Morula |
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Day 5... |
Fluid filled cavity develops inside morula call Blastocyst |
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Differentiation occurs developing 2 specialized structures... |
1) Trophoblast: becomes Chorion and secretes hCG to maintain corpus liteum 2) Inner cell mass = becomes embryo |
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Event of implantation in endometrium occurs on... |
Day 6 |
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Day 15 inner cell mass differentiates and migrates into... |
3 primary germ layers called gastrulation |
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The 3 primary germ layers |
1. Ectoderm = Develops into epidermis and nervous system 2. Mesoderm = develop into muscle/bone/connective tissue/peritoneum 3. Endoderm = develops into lining of respiratory, GI tract, other organs |
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Process of neurulation |
Differentiation of ectoderm into brain and spinal cord |
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Aminion |
Protective layer that produces amniotic fluid (shock absorber) |
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Chorionic villi |
= Fetal part of placenta • secretes proteins that block maternal antibody production •secretes hCG |
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Yolk sac |
Source of nutrients and blood cells in first few weeks |
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Chorionic villi containing blood vessels grow into... |
Endometrium |
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Umbilical cord contains... |
•2 arteries (deoxygenated blood/waste away from fetus) • 1 vein (carries O2 ND nutrients to fetus) |
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1 month embryo is when? Occurs between? |
• Occurs between week 4 to 8 • Process in which body organs and system develop |
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By end of 8 weeks... |
•All body systems are developing •Limbs Visible •Eyes and ears (pinna) present •External genitalia differentiating |
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hCG secreted/stimulates/ detected/ peaks |
•Secreted by chorion •Stimulates corpus luteum to continue production of progesterone & estrogen •Detected 7 days into fertilization •Peaks at 8 weeks |
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Relaxin |
•Increases flexibility of joints •Dilates cervix during labor |
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Estrogen/progesterone secreted by... |
Corpus luteum (early) Placenta (3rd month) |
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Actions of estrogen/progesterone |
•Maintain endometrium (pro) •Prepare mammary glands (est) •Keeps cervix closed (pro) |
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All somatic cells contain... |
23 chromosome pairs |
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1 chromosome = |
1 DNA + Proteins |
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Autosome = |
Determine body traits |
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Alternative forms of genes are called... |
Alleles |