chapter 4 child - Prenatal Development Birth 1 3 Stages a...

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Prenatal Development Birth 1. 3 Stages a. Zygote i. One celled zygote divides and becomes blastocyst. Blastocyst implants into uterine wall; structures that nourish and protect the organism --- amnion, chorion, yolk sac, placenta, umbilical cord --- begin to form ii. 1 to 2 weeks b. Embryo i. Brain, spinal cord and heart form as do the rudimentary structures that will become the eyes, ears, nose, mouth and limbs ii. 3 to 8 weeks c. Fetus i. Rapid growth and inter connections of all organ systems permit such new competencies as body and limb movements, swallowing, digestion of nutrients, urination. External gentitalia form. ii. Fetus grows rapidly, fetal movements are felt by they mother and fetal heartbeat can be heard. Fetus is covered by vernix to prevent chapping; it also reacts to bright lights and loud sounds. iii. Growth continues and all organ systems mature in preparation for birth. Fetus reaches the age of viability and becomes more regular and predictable in its sleep cycles and motor activity. Layer of fat
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This note was uploaded on 04/17/2008 for the course PSYCH 021 taught by Professor Dr.v during the Fall '08 term at Drake University .

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chapter 4 child - Prenatal Development Birth 1 3 Stages a...

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