Embryo Weeks 1-8
Terms
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- What 3 things are needed to give you testis?
-
1. Testosterone
2. MIF
3. Sry gene encoding TDF (Testis determining factor) - List the events taking place in Meiosis I:
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1. Pairing of 46 homo chromes
2. Crossing over
3. Disjunction: w/o centromere splitting - Meiosis I causes a:
-
Reduce in number
46--> 23 - Meiosis II causes a:
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Reduce in ploidy
2N --> 1N - List the events taking place in Meiosis:
- Disjunction WITH centromere splitting
- What stage is an egg in if a patient ovulates but the egg is not fertilized:
- Secondary oocyte did nto complete meiosis II
- All primary oocytes are formed by 5 months and are stored in what form until puberty?
- Meiosis I prophase
- Secondary oocytes are arrested in what state after puberty?
- Meiosis II Metaphase
- Fertilization of a secondary oocyte means it has?
- Completed Meiosis II to form a mature oocyte and polar body
- A blastocyst splits into:
- Embryoblast and Trophoblast
- Trophoblasts split into:
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Cytotrophoblast and Syncitiotrophoblast
Embryoblast becomes the embryo - Blastocyst is characterized by a:
- Fluid filled cavity
-
Embryoblast becomes:
Trophoblast becomes: -
Embryo
Placenta - What layer must degenerate for implantation to occur?
- Zona pellucida
- The blastocyst implants in the functional layer of the endometrium during what phase of the cyle?
- Progestational phase
- Embryoblast splits into:
- Epiblast and Hypoblast
- Mitosis takes place in what division of the trophoblast?
- Cyto
- What division of the trophoblast makes HCG?
- Syncytio
- The future mouth starts as:
- Prochordal plate
-
Zygote:
Embryo:
Fetus: -
1-2 wks
3-8 wks
Rest - The first missed menstrual period signifies what week of embryonic development?
- Week 3
- What is a chordoma?
- Tumor of the remnants of the notochord found in the sacral region
- List derivatives from the Neural Crest:
-
AM
Ganglia
Schwann Cells
Meninges
Pharyngeal arch cartilage - List derivatives from the Neuroectoderm:
-
All neurons
Retina
Neurohypophysis
Astrocytes
Oligodendrocytes