Color the Neuron and Neuroglial Cells

Color the following:

Oligodendrocytes (purple)
Astrocyte (green)
Ependymal Cells (orange)
Body of Neuron (blue)
Myelin sheaths (pink)
Capillary (red)
Microglial cells (yellow)
Nodes of Ranvier and the Axon (brown)

Questions

1) Describe the function of the following parts: 
    Oligodendrocytes ____________________________________________
    Astrocytes _________________________________________________
    Microglial cells _____________________________________________
    Myelin sheaths ______________________________________________
2) Describe the path of a nerve impulse in a neuron starting with the dendrite: