Detrimental Effects of The Scar
The glial scar also prevents neuronal regrowth. Following trauma to the CNS, axons begin to sprout and attempt to extend across the injury site in order to repair the damaged regions. However, the scar prevents axonal extensions via physical and chemical means. Astrocytes form a dense network of gap junctions that generates a physical barrier to axonal regrowth. Further, the astrocytes secrete several growth-inhibitory molecules that chemically prevent axonal extensions. Moreover, the basal membrane component is expected to generate an additional physical and chemical barrier to axonal extensions.
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