A Astrocyte B Dendrite C Ependymal cell D Microglial cell AE Oligodendrocyte BC Satellite cell CD Soma CE Synapse E Nerve AB Neurofibril AC Nissl body AD Node of Ranvier BD Schwann cell DE Tract BE Sheath of Schwann 1 Axon regeneration 2 Blood brain 9 Gap between Central myelin sheath Cerebrospinal fluid Cytoskeleton Exchange of materials 13 Peripheral myelin sheath 14 Phagocytosis 5 neurons 10 Gap within axons barrier 3 Cell body Central axon 11 Input 12 Peripheral axon 7 15 Rough ER 4 8

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