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CNS, When neuroblast is no more produced, Roof, Floor, Roof + floor → not…

- - - - Mantle layer (= gray matter)
        
        Ventral = Basal plate
        
        Dorsal = Alar plate
        
        Intermediate horn = neurons of sympathetic portions of ANS
      - Marginal layer (= white matter)
- - - - Ventral motor root of spinal nerve = conduct motor impulse from spinal cord → muscle
      - Dorsal sensory horn : associations neurons
      - 1- Round apolar
        2- Bipolar neuroblast
        3- Multipolar
        ➡︎ Neuron