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The rostral-most portion of the prosencephalon, the telencephalon, expands posteriorly and laterally as the cerebral hemispheres.

 

 
                     Species: Mouse 
                     Day Gestation: 14 
             Approx. Human Age: 9 weeks 
                                   View: Sagittal Cut
 
                 Brain (Weeks 9-16)
                                       18 of 20