CHAPTER 4

Development and Teratogenesis

CHAPTER OBJECTIVES

• Review basic embryology.
  
• Understand the etiology and distribution of congenital anomalies.
  
• Define teratogenesis and describe the three main principles underlying this process.
  
• Describe major defects involved with examples of teratogens.

KEY TERMS

Amnion

Blastocyst

Ectoderm

Embryo

Endoderm

Fetal alcohol effect

Hydrocephalus

Inner cell mass (ICM)

Mesoderm

Microcephaly

Morning-after pill

Morula

Organogenesis

Paracrines

Parturition

Phocomelia

Placenta

Porencephaly

Trophoblast

Yolk sac

Zygote

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