Chapters

7.0 Learning aims, what you should already know, introduction, delving deeper

• Learning aims
  
• What you should already know
  
• Introduction
• Delving deeper

7.1 The bilaminar germ disk (2nd week)

• Review of the development during the 2nd embryonic week

7.2 The trilaminar germ disk (3rd week)

• Introduction
  
• Formation of the primitive streak
• Genesis of the germ layers
• Genesis of the notochord
• Location of the epiblast cell target and the development of the primitive streak
• The bilaminar membranes
• Evolution of the mesoblast
  • The paraxial mesoblast and the differentiation of the somites
  • The intermediate mesoblast
  • The lateral mesoblast
• The intraembryonic coelom
• Induction of the neural plate - neurulation

7.3 Pathologies

• Sacro-coccygeal teratoma
• Chordoma
• Caudal dysplasia
• Abnormalities in the closure of the neural tube
  • Spina bifida occulta
  • Spina bifida in combination with a dermoid cyst
  • Spina bifida aperta (meningocele, meningomyelocele, myeloschisis)
  • Anencephaly

7.4 Quiz

• Test your knowledge

7.5 Brief summary

• Summarized

7.6 Bibliography

• References