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The mesencephalon is not subdivided, while the rhombencephalon is divided into the metencephalon:and the myelencephalon:In the rhombencephalon, subsegments termed rhombomeres are apparent, as is the thin layer of cells at the dorsal-most aspect of this brain region.

                     Species: Mouse 
                     Day Gestation: 10 
             Approx. Human Age: 5 weeks 
                                   View: Sagittal Cut 
                  Brain (Weeks 5-9)
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