this acts as a support system for neurons
allows the impulse to travel faster by jumping from node to node in saltatory(jumping) fashion
fatty tissue covery some axons-speeds up transmission of neural impluses
in regeneration process of axon in PNS, which part for a regeneration tube and secrete growth factors: axons, macrophages or schwann cell.
node of ranvier
small gap between myelinated segments where axonal membrane is exposed; increase speed of impulses