Summary OBGYN 101 Study Guide – Chapters 10–12: Normal Pregnancy Concepts, Changes, and Nursing Care

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OB Exam 1 Study Guide Susset H. Alcover




Concepts Of Maternal-
Child Nursing And
Families )

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OB Exam 1 Study Guide Susset H. Alcover




CH 10 – Fetal Development and Genetics

Embryonic Layers
• Ectoderm: forms the central nervous system, special senses, skin, and glands
• Mesoderm: forms skeletal, urinary, circulatory, and reproductive organs
• Endoderm: forms respiratory system, liver, pancreas, and digestive system




Functions of the Placenta
 Serving as the interface between the mother and fetus
 Making hormones to control the physiology of the mother
 Protecting the fetus from immune attack by the mother
 Removing waste products from the fetus
 Inducing the mother to bring more food to the placenta
 Producing hormones that mature into fetal organs

Function of Amniotic Fluid
• Helps maintain a constant body temperature for the fetus
• Permits symmetric growth and development
• Cushions the fetus from trauma
• Allows the umbilical cord to be relatively free of compression
• Promotes fetal movement to enhance musculoskeletal development

Fetal Circulation
• Blood from the placenta to and through the fetus and then back to placenta (see Figure 10.9)
• Three shunts during fetal life:
• Ductus venosus: connects the umbilical vein to the inferior vena cava
• Ductus arteriosus: connects the main pulmonary artery to the aorta