Development Flashcards
1
Q
Prenatal period
A
is the period from conception to birth
2
Q
Germinal
A
- fertilization to 14 days.
- The primitive germ layers form during this time
3
Q
embryonic period
A
days 14 to 56 of development.
* The major organ systems form during this period.
* Fertilization to 8 weeks of development
4
Q
fetal period
A
- day 56 to birth (the last 30 weeks of development).
- The organ systems grow and become more mature during this time. week 8 to birth
5
Q
fertilization
A
- union of sperm cell and oocytes along with chromosomes. Sperm cells do not enter oocyte, only DNA. All our organelles
6
Q
capacitation
A
makes sperm capable of releasing enzymes to reach oocyte
7
Q
zygote
A
results from fusion of sperm and oocyte (contain 46 chromosomes)
8
Q
Placenta
A
structure derived from embryonic and maternal tissues where fetus and mother are connected
9
Q
Umbilical cord
A
- connecting stalk between placenta and embryo
- contains blood vessels that carry
blood from embryo to placenta and from placenta to embryo - Embryonic and maternal blood supply are separate, do not mix
- Nutrients and waste products must cross a semipermeable barrier between the two circulations.
10
Q
Ectoderm (outer layer)
A
- Epidermis of Skin
- Brain and Spinal Cord
- Lens and cornea of eye
11
Q
Mesoderm (middle layer)
A
- Dermis of Skin
- Heart and Blood Vessels
- Muscles and Bones
- Kidneys and Gonads
12
Q
Endoderm
A
- Lining of the digestive tract
- Lining of lungs
13
Q
Neural plate
A
- 18 days after fertilization
- ectoderm overlying on the dorsal
side
14
Q
Neural folds
A
edges of neural plate rise and come together
15
Q
Neural tube
A
neural folds meet in midline and
fuse forming a tube
* becomes brain, spinal cord, parts of peripheral nervous system
