This document discusses conception and fetal development. It covers topics like gametogenesis, fertilization, implantation, formation of the primary germ layers, development of fetal membranes and organs, fetal circulation, maturation of body systems, factors influencing development like teratogens, and multiple gestations.

1. Chapter 6
Conception
and Fetal Development
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2.  Cell division
 Mitosis
 Meiosis
 Gametogenesis
 Spermatogenesis
 Oogenesis
 Conception
 Ovum
 Sperm
Conception
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7.  Fertilization
 Morula
 Blastocyst
 Implantation
 Chorionic villi
 Decidua basalis
Conception (Cont.)
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9.  Primary germ layers
 Ectoderm
 Mesoderm
 Endoderm
 Development of the embryo
 Membranes
 Chorion
 Amnion and amniotic cavity
Embryo and Fetus
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10.  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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12.  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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17.  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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19.  Fetal maturation
 Hematopoietic system
 Respiratory system
• Primary surfactants
 Gastrointestinal system
 Hepatic system
 Renal system
Embryo and Fetus (Cont.)
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21.  Fetal maturation
 Neurologic system
• Sensory awareness
 Endocrine system
 Reproductive system
 Musculoskeletal system
 Integumentary system
 Immunologic system
Embryo and Fetus (Cont.)
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22.  Multifetal pregnancy
 Twins
• Dizygotic twins
• Monozygotic twins
• Conjoined twins
 Other multifetal pregnancies
Embryo and Fetus (Cont.)
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26.  Teratogens
 Drugs
 Chemicals
 Infection
 Exposure to radiation
 Maternal conditions
 Maternal nutrition
 Malnutrition
Nongenetic Factors
Influencing Development
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27.  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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