Factors in Embryology:

• Cell Division
• Cell Growth

Determination

• Progressive Differentiation
• Intracellular Localization of Signals
• Selective Cell Adhesion
• Folding of Sheets of Cells (epithelia)
• Cell Migration
• Cell Shape Changes

Induction

Programmed Cell Death

Body Layers (epithelia):

• Ectoderm
• Mesoderm
• Endoderm