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Chapter+4-+student+version - Prenatal Development and Birth...

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1 Prenatal Development and Birth Chapter 4
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2 Lecture Overview Video Prenatal Development Prenatal Stages Teratogens Perinatal Environment Postnatal Environment
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3 Videos!
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4 PRENATAL DEVELOPMENT Conception Every ___days an ovum is released from ovary and remains viable for approximately _____. Released into the vaginal canal, sperm remain viable for up to _____. Conception is in the _____, where sperm and ovum unite to form the zygote. Most conceptions result from intercourse ______ preceding ovulation.
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5 Period of the Zygote a.k.a. Germinal Period Lasts about _____ from fertilization. The zygote drifts out of the fallopian tubes and attaches to the uterine wall. _______: 60 to 70 cells form a hollow ball. ________ (cells inside) becomes the new organism.
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6 Fertilization and Implantation Figure 3.1 Female Reproductive Organs
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7 Implantation, Placenta and the Umbilical Cord Blastocyst burrows into the lining of the uterus. Occurs between the _______ day. 30-50% of zygotes do not make it through this phase. ______ Permits food and oxygen to reach the zygote and waste products to be carried away. _______ Connects the placenta to the developing organism.
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8 Period of the Embryo Second through the eighth week of pregnancy In third week, the embryonic disk forms three layers. _____ Nervous system and skin _____ Muscles, skeleton, circulatory system, and internal organs _____ Digestive system, lungs, urinary tract, and glands The neural tube, a primitive spinal cord, develops. The embryo can move, and it responds to touch. Most risky time period- ___________________
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9 Scenario: A pregnant woman reluctant to give up her morning cup of coffee and nightly glass of wine says, “I drink so little coffee and wine that it couldn’t possibly hurt my baby.”
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10 PRENATAL ENVIRONMENTAL INFLUENCES Teratogens:
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11 Teratogens (cont.) Figure 3.3
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12 Damage done by teratogens is influenced by: 1. Age of the prenatal organism 1. - 2. - 3. Other negative influences 5. Quality of the postnatal environment
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13 Prescription and Nonprescription Drugs - Severe limb deformations - Linked to low birth weight, infant death around the time of birth, poorer motor development, and lower intelligence scores in early childhood - Linked to prematurity, miscarriage, and newborn withdrawal symptoms, such as irritability and vomiting
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Upper limbs Shoulder, Arm, Elbow, Forearm, Hand, Fingers Lower limbs Hip, Thigh, Knee, Lower leg, Foot,
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Chapter+4-+student+version - Prenatal Development and Birth...

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