CPChapter3

CPChapter3 - Chapter Three Prenatal Development and Birth...

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4/7/11 Prenatal Development and Birth Chapter Three
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4/7/11 Stages of Prenatal Encompasses 38 weeks or 9 months Contains 3 periods (trimesters) Zygote – first 2 weeks of life Embryo – 3rd wk of gestation to 8th wk of life Amniotic sac and fluid – protective buffer Placenta joins infant by umbilical cord Umbilical cord – tube of blood vessels
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4/7/11 The three trimesters of prenatal developme nt 16 weeks 20 weeks 24 weeks Less than 1/10th of an inch long 8 weeks Less than 1 inch long 32 weeks About 16.5-18 inches long, weighs 4 to 5 pounds 36 to 38 19 inche s long, weig hs 6 poun ds About 5.5 inches long, weighs about 4 ounces About 10-12 inches long, weighs 1/2 to 1 pound About 11-14 inches long, weighs 1 to 1.5 pounds 28 About 14-17 inches long, weighs 2.5 to 3 pounds 12 weeks About 3 inches long, weighs about 1 ounce Conception to 4 wks First trimester begins Third trimester begins Second trimester begins
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4/7/11 Umbilical cord Umbilical arteries Umbilical vein Uterus Maternal portion of placenta Placenta Fetal portion of placenta The Placenta and the Umbilical Cord
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4/7/11 Stages of Prenatal Some destructive substances such as drugs, viruses, and antibodies can pass through placenta In the embryonic period Ectoderm forms outer skin, nails, hair, and nervous system Mesoderm forms muscles and
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4/7/11 Stages of Prenatal Neural folds begin to close to form CNS, failure to close results in spina bifida Cephalocaudal development pattern of human physical growth proceeds from head downward Proximal-distal development –
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4/7/11 Cephalocaudal development
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4/7/11 Stages of Prenatal Most miscarriages occur during the embryonic period During fetal period Rapid muscular development occurs Rapid development in CNS Fetal movement usually by 4th month Reflexes usually appear about 5 months After 5 months, lanugo (soft hair)
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This note was uploaded on 04/07/2011 for the course PSYC 2076 taught by Professor Staff during the Fall '10 term at LSU.

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CPChapter3 - Chapter Three Prenatal Development and Birth...

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