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Embryology development of the limbs, Gastrulation, End of week 2, Day 15,…

- - - - Neural ectoderm
      - Surface ectoderm:
        
        Epidermis
        
        Outer layer of everything in the body
    - - Paraxial mesoderm
        
        Somites (40)
        
        Sclerotome
        
        Ventral subdivision
        
        Vertebral body
        
        Dorsal subdivision
        
        Vertebral arch
        
        Resegmentation
        
        Dermomyotome
        
        Myotome
        
        Epimere
        
        Give rise to skeletal muscles of the back
        
        Hypomere
        
        Give rise to skeletal muscles of the upper and lower limbs + ventral side of the trunck
        
        Dermatome
        
        will give rise to the dermis of the skin of the back
        Dermis of the skin of ventral trunk and upper and lower limbs originates from the lateral mesoderm
      - Intermediate mesoderm
        
        GU system
      - Lateral mesoderm
        
        Somatic (parietal)
        
        Appendicular skeleton
        
        Most dermis
        
        Lining of body wall
        
        Splanchnic (viseral)
        
        CVS
        
        Mesothelial coverings of visceral organs
    - - Inner layer of every part in the body