Lec 1 Flashcards
1
Q
Phases of embryology
A
Week 1-2 pre embryonic phase
Week 3-8 embryonic phase (embryo)
Week 9 fetus
2
Q
Gestation
A
full development of fetus in utero
3
Q
At what week are all organ systems structured?
A
9
4
Q
Describe the initial cellular divisions that occur
A
Morula - 16 cells
Blastocyte - 70-100
- outer trophoblasts
- inner embryoblasts
- cavity is the blastocoel, FORMED BY END OF FIRST WEEK
after blastocoel is formed it sheds its zona pellicuda and implants into uterine wall
5
Q
Gastrulation
A
3rd week
epiblasts and hypoblasts differentiate into 3 germ layers
6
Q
Endoderm
A
- epithelial lining of digestive and respiratory tracts
-lining of urethra, bladder and reproductive system - liver and pancreas
7
Q
Mesoderm
A
- notochord (vertebrae)
- musculoskeletal
- muscular layer of stomach
intestine - circulatory
8
Q
ectoderm
A
epidermis of skin
cornea and lens of eye
nervous system
9
Q
Where is the pars interarticularis?
A
wraps around arch between superior and inferior facets
