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Early Development, yolk <, yolk >>> - Coggle Diagram

- - - - Sparse, equally distributed yolk
        
        Radial :star:
        
        Spiral ~
        
        Bilateral :ocean:
        
        Rotational :woman:
    - - Moderate yolk
        
        Displaced radial :frog:
  - - - Telolecithal :egg:
        
        cleavage in only small part/disc without yolk
        
        Bilateral :octopus:
        
        Discoidal :fish::bird::lizard:
      - Centrolecithal :beetle:
        
        central yolk, so divisions only in cc periphery (superficial cleavage)
- - - - invagination
        
        folding in
      - involution
        
        inward movement of outer layer + spreading
      - ingression
        
        migration of ccs from surface into interior (become mesenchymal :silhouette::airplane:)
      - epiboly
        
        movement of a sheet (as a unit) to enclose deeper areas
      - delamination
        
        splitting of one sheet of cells into two (on top of each other =)
    - - AP
      - DV
      - RL (lateral)