Summary: Embryology

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• 1 2: General Introduction

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• What is the 1st prenatal period?

  Embryogenesis

• What is the relationship between embryogenesis and organogenesis?

  Organogenesis occurs during embryogenesis

• What is the 2nd prenatal period?

  Fetal period

• What is the difference between Embryonic Development and Clinical Staging of Human Development?

  
  The clinical staging is 2 weeks longer than the embryonic development because clinical staging of human development starts after the last menstrual period (LMP) while embryonic staging of human development starts after ovulation. 
  

• What is the more accurate measure between embryonic development and clinical staging of human development, and why?

  Since ovulation is variable by individuals, clinical staging, which uses LMP, is a more accurate measure

• What happens during week 1 of embryonic development?

  
  1. Formation of trophoblast and embryoblast
  2. Migration from ampulla of uterine tube to uterine cavity
  3. Hatching of blastocyst from zona pellucida 
  4. Implantation begins

• What can trophoblast differentiate into?

  
  Trophoblast has the capacity to generate the membranes associated with the embryo 

• What can embryoblast differentiate into?

  Embryoblast has the capacity to generate embryo 

• What could go wrong in week 1 of embryonic development?

  Reduced motility in uterine tube can lead to ectopic implantation, which is implantation of fertilized egg in a place other than the lining of the uterus 

• What happens in week 2 of embryonic development?

  
  1. Completion of implantation 
  2. Formation of bilaminar embryonic disc (epiblast and hypoblast) 
  3. Development of the amniotic cavity 
  4. Formation of the umbilical vesicle (yolk sac) 
  5. Development of the chorionic sac