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The brachial plexus, derived from cervical segments 5-8 and the first thoracic segment, innervates the upper limb. These nerves and their dorsal root ganglia are illustrated in the micrograph. The lower limb is innervated by the lumbosacral plexus. 
                     Species: Mouse 
                     Day Gestation: 11 
             Approx. Human Age: 33 days 
                                   View: Ventral
 
               Limb Development
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