ASU Chapter 3: Prenatal Development and Birth Flashcards
THE COURSE OF PRENATAL DEVELOPMENT:
This period takes place in the first two weeks after conception.
Germinal Period
THE COURSE OF PRENATAL DEVELOPMENT:
Inner layer of cells that develops into the embryo.
Blastocyst
THE COURSE OF PRENATAL DEVELOPMENT:
Outer layer of cells that provides nutrition to and support for the embryo.
Trophoblast
THE COURSE OF PRENATAL DEVELOPMENT:
This period occurs two to eight weeks after conception.
Embryonic Period
THE COURSE OF PRENATAL DEVELOPMENT:
3 layers of cells forming the embryo.
- Endoderm
- Mesoderm
- Ectoderm
THE COURSE OF PRENATAL DEVELOPMENT:
Organs appear within this prenatal period.
Embryonic Period
THE COURSE OF PRENATAL DEVELOPMENT:
Contains a clear fluid in which the developing embryo floats.
Amnion
THE COURSE OF PRENATAL DEVELOPMENT:
Contains two arteries and a vein — connects the baby to the placenta.
Umbilical Cord
THE COURSE OF PRENATAL DEVELOPMENT:
Disk-shaped group of tissues in which small blood vessels from the mother and offspring intertwine but do not join.
Placenta
THE COURSE OF PRENATAL DEVELOPMENT:
Process of organ formation that takes place during the first two months of prenatal development.
Organogenesis
THE COURSE OF PRENATAL DEVELOPMENT:
This period occurs between two months after conception and birth.
Fetal Period
TRIMESTERS OF PRENATAL DEVELOPMENT:
FIRST TRIMESTER:
- Amniotic sac envelops preliminary tissues of entire body.
- Organism is now called “zygote”
Conception to 4 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
FIRST TRIMESTER:
- Fetal heatbeat detectable with ultrasound
- Now called an “embryo”
8 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
FIRST TRIMESTER:
- Sex distinguishable
- Now called a “fetus”
- Can urinate
12 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
SECOND TRIMESTER:
- Lanugo (downy hair) covers the bdy
- Able to roll over in amniotic fluid
- Strong heartbeat
16 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
SECOND TRIMESTER:
- Can suck their thumb
- Hiccups
- Heartbeat audible with stethoscope
20 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
SECOND TRIMESTER:
- Eyes are open
- Skin is wrinkled; covered by protective coating (Vernix Caseosa)
- Waste matter collected in bowel
24 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
THIRD TRIMESTER:
- Very active
- Adding body fat
- Rudimentary breathing movements present
28 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
THIRD TRIMESTER:
- Has periods of sleep and wakefulness
- May assume the birth position
- Bones of head are soft and flexible
32 Weeks
TRIMESTERS OF PRENATAL DEVELOPMENT:
THIRD TRIMESTER:
- Skin less wrinkled; Vernix Caseosa is thick
- Less active
- Gaining immunities from parent
36 to 38 Weeks
THE COURSE OF PRENATAL DEVELOPMENT:
Nerve cells which handle information processing at the cellular level in the brain.
Neurons
THE COURSE OF PRENATAL DEVELOPMENT:
Failure of the neural tube to close may cause _______ and ______.
Anencephaly and Spina Bifida
THE COURSE OF PRENATAL DEVELOPMENT:
Generation of new neurons.
Neurogenesis
THE COURSE OF PRENATAL DEVELOPMENT:
Cells moving outward from their point of origin to their appropriate locations.
Neuronal Migration
THE COURSE OF PRENATAL DEVELOPMENT:
Enumerate the 4 important Phases of the Brain’s Development.
- Neural Tube
- Neurogenesis
- Neuronal Migration
- Neural Connectivity