PSYCH 7A Lecture Notes - Lecture 13: Habituation, Plantar Reflex, Primitive Reflexes
29 Jun 2018
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PSYCH 7A - Lecture 13 - Development
Prenatal Development
●3 Stages of prenatal development:
○Germinal Period (First 7 – 10 days)
○Embryonic Period (2nd week – 8th week)
○Fetal Period (9th week – birth)
Germinal Period
●Zygote – an egg that has been fertilized by a sperm cell
●Cells divide
●Differentiation – specialization in structure and function
●After a week, the mass of cells (now called a blastocyst) consists of about 100 cells
Embryonic Period
●Outer part of blastocyst attaches to the uterine wall, forming the placenta.
●The blastocyst inner cells become the embryo.
●Over this two month period:
○all major organs begin to form
○heart and liver begin to function
○embryo grows to about an inch
Fetal Period
●9 weeks – embryo definitely looks human! It’s now called a fetus.
●6 months – organs developed enough to give fetus a chance at survival.
●Fetus is responsive to sound.
Teratogens
●Placenta – keeps potentially harmful substances from reaching the embryo or fetus
●Teratogens – harmful substances that can reach the embryo or fetus.
●Teratogens include: viruses, drugs, and many other chemicals
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Document Summary
Germinal period (first 7 10 days) Embryonic period (2nd week 8th week) Zygote an egg that has been fertilized by a sperm cell. Differentiation specialization in structure and function. After a week, the mass of cells (now called a blastocyst) consists of about 100 cells. Outer part of blastocyst attaches to the uterine wall, forming the placenta. The blastocyst inner cells become the embryo. 9 weeks embryo definitely looks human! 6 months organs developed enough to give fetus a chance at survival. Placenta keeps potentially harmful substances from reaching the embryo or fetus. Teratogens harmful substances that can reach the embryo or fetus. Teratogens include: viruses, drugs, and many other chemicals. Alcohol consumption during first 3 months can result in fetal alcohol syndrome (fas) Fas is the leading cause of mental retardation. Newborns have very little control over their motor skills. Reflexes help them get through first few months of helplessness. Prefer sights and sounds that promote social responsiveness:
