HDFS 2010 Lecture 5: HDFS 2010 Lecture #5
18 Feb 2019
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Lecture #5 —
-At the end of the third month of conception, the fetus has all of it’s body parts
-Fetuses jump in respond to sudden nosies
-A baby’s “due date” is established 40 weeks after the last day of your last period
-Big Questions -
•What are the three main phases of prenatal growth?
•Why do most zygotes never become babies?
•What is the age of viability?
•What is the Apgar test? What is a good score?
•What are teratogens?
•How does culture impact the birthing process/birth?
•How does pregnancy and delivery impact family?
-Prenatal Growth -
•Three main periods of prenatal development
-Germinal Period: (1st two weeks after conception) rapid cell division and
beginning of cell differentiation
•zygote begins duplication and division within hours of conception
•development of the placenta
-organ that surrounds the developing embryo
-sustains life via the umbilical cord
•Implantation (about 10 days after conception)
-developing organism burrows into the placenta that lines the uterus
-Embryonic Period: (3rd through 8th week) basic forms of all body structures
develop
•3rd through 8th were of conception
•begins when the primitive streak appears down the middle of the cell mass
•primitive streak becomes the neural tube and alter the bran and spinal column
•eyes, ears, nose, and mouth form
•heart begins to pulsate
•extremities developed and webbed fingers and toes separate
-Fetal Period: (9th week until birth) fetus grows in size and matures in functioning
•9th week after conception until birth
•genitals form and sex hormones cause differences in brain organization
•cephalocaudal and proximodistal growth
•heartbeat is detectable
•cortex is not fully mature at birth
•head at birth is biggest part of baby
•Age of Viability:
-age at which a preterm newborn may survive outside the womb with medial
care
-about 22 weeks after conception
-brain is bale to regulate basic body functions
-chances of survival increase with each day after that mark
-Vulnerability During Prenatal Development -
•The Germinal Period
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