chapter 006 conception and fetal dev audio
TRANSCRIPT
Chapter 6
Conception
and Fetal Development
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Cell division
Mitosis
Meiosis
Gametogenesis
Spermatogenesis
Oogenesis
Conception
Ovum
Sperm
Conception
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Fertilization
Morula
Blastocyst
Implantation
Chorionic villi
Decidua basalis
Conception (Cont.)
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Primary germ layers
Ectoderm
Mesoderm
Endoderm
Development of the embryo
Membranes
Chorion
Amnion and amniotic cavity
Embryo and Fetus
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Amniotic fluid
Serves numerous functions
Volume is important to fetal well-being
Yolk sac
Becomes primitive digestive system
Umbilical cord
Supplies the embryo with maternal nutrients and
oxygen
Embryo and Fetus (Cont.)
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Placenta
Structure
• Maternal-placental-embryonic circulation by day 17
Function
• Endocrine gland
• Metabolic function and waste
• Nutrient storage
Embryo and Fetus (Cont.)
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Fetal maturation
Viability
• Capability of fetus to survive outside uterus
• Limitations based on central nervous system function and
oxygenation capability of lungs
Fetal circulatory system
• FHR 110 to 160 beats/min
Embryo and Fetus (Cont.)
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Fetal maturation
Hematopoietic system
Respiratory system
• Primary surfactants
Gastrointestinal system
Hepatic system
Renal system
Embryo and Fetus (Cont.)
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Fetal maturation
Neurologic system
• Sensory awareness
Endocrine system
Reproductive system
Musculoskeletal system
Integumentary system
Immunologic system
Embryo and Fetus (Cont.)
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Multifetal pregnancy
Twins
• Dizygotic twins
• Monozygotic twins
• Conjoined twins
Other multifetal pregnancies
Embryo and Fetus (Cont.)
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Teratogens
Drugs
Chemicals
Infection
Exposure to radiation
Maternal conditions
Maternal nutrition
Malnutrition
Nongenetic Factors
Influencing Development
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A woman is 8 months pregnant. She tells the nurse that
she knows her baby listens to her but her husband thinks
she is imagining things. The most appropriate response
by the nurse is:
“Many women imagine what their baby is like.”
“Babies in utero do respond to their mother’s voice.”
“You’ll need to ask the doctor if the baby can hear yet.”
“Thinking that your baby hears will help you bond with
the baby.”
Question
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