Midterm Quiz Flashcards
Fertilization to first two weeks
The zygote divides becomes more complex and is implanted in the wall of uterus
Germinal period
36 hours after = ?
Rapid mitosis
72 hours after = ?
16 - 32 - 64 cells
Fluid - filled sphere
Consists of an inner mass of cells that will eventually develop into the embryo
Blastocyst
2 main components of blastocyst
Inner Cell Mass
Trophoblast
An outer layer of cells called the trophectoderm surrounds the ICM
Trophoblast
Plays a crucial role in implantation and further development
Trophectoderm
Also known as the embryoblast , this group of cells eventually gives rise to the embryo
Inner Cell Mass
Upper layer, will become the outer layer of skin, the nails, teeth, sensory organs and nervous system
Ectoderm
Inner layer, will become the digestive system,liver, pancreas, salivary gland and respiratory system
Endoderm
Middle layer, will develop and differentiate into inner layer of skin , muscles, skeleton, and excretory & ciculatory systems
Mesoderm
A thickened cell mass from which the embryo begins to develop
Embryonic Disc
Blastocyst occurs an about between 6 to 12 days
Implantation
An outer layer of cells provide nutrition & support to embryo
Trophoblast
Fluid filled membrane that encase the developing embryo, protecting and giving it room to move and grow
Amnion cavity / amniotic sac / amnion
Allows oxygen, nourishment, and wastes to pass between mother and embryo
Placenta
Connect to the embryo contains two arteries and one vein, it connects the baby to the placenta
Umbilical cord
Occurs 2 to 8 weeks after conception
Critical period
Stage were the brain development begins
Embryonic period
Respiratory, digestive and nervous system develop rapidly through?
Organogenesis
It is the name given to the process of organ formation during 1st 2 months of prenatal development
Organogenesis
Miscarriage the expulsion from the uterus of an embryo fetus that is unable to survive outside the womb
Spontaneous Abortion
8 weeks to birth
The appearance of first bone cell signals this stage
Fetal period
Sex is detectable in how many months?
3 months after conception
Mother can feel the fetus move quickening in what month?
Fourth month
In this month Fetus is more active, showing a preference for a particular position in the womb lie i
Fifth month
Thin, soft and poorly pigmented hair covers the body of the fetus
Lanugo
At this month, the fetus has a chance of surviving outside the womb that is viable
Sixth month
During this month the fetus has fully developed
Seventh month
Movements are curtailed during this month and a layer of fat is developing to enable the fetus adjustments to the temperature outside the womb
8th months
Comes from the greek word tera means monster
Is an environmental agents such as virus, drug, or a radiation that can interfere the normal prenatal development
Teratogen
