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Mesoderm is also present in the midline, forming the notochord, which underlies the neural tube.

Each somite differentiates, forming a dermomyotome (dermatome plus myotome) and a sclerotome.

 
                     Species: Mouse 
                     Day Gestation: 9 
             Approx. Human Age: 27 days 
                                   View: Transverse Cut
 
          Musculoskeletal (Late Week 4)
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