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3 to 8 weeks : Embryonic/Organogenesis period = time when each of the…

- - - - Somites
        
        42 to 44 pairs are present
        
        12 thoracic
        
        5 lumbar
        
        8 cervical
        
        5 sacral
        
        4 occipital
        
        8-10 coccygeal
        
        Remaining somites = Axial skeleton
        
        Ventro/medial wall
        
        Sclerotome = mesenchyme
        
        Surrounds SC and notochord to form = Vertebral column
        
        Dorsolateral
        
        Precursor limb and body wall musculature
        
        Dorsomedial
        
        Myotome
        = Muscle of the back
        
        Remaining dorsal
        
        Dermatome
        = Dermis subcutaneous tissue
        
        Each somites form its own Sclerotome, myotome, dermatome
  - - - Lateral and ventral body wall
    - - Wall of the gut