Compared to the PNS, axon regeneration in the CNS is restricted by which of the following factors?
A) oligodendrocytes do not release a nerve growth factor
B) crowded axons in the brain and spinal cord complicate regrowth
C) astrocytes and connective tissue coverings may form obstructive scar tissue
D) oligodendrocytes produce inhibitory factors that may interfere with regeneration of axons in the CNS
E) absence of endoneurial tube
F) all of the above
A) oligodendrocytes do not release a nerve growth factor
B) crowded axons in the brain and spinal cord complicate regrowth
C) astrocytes and connective tissue coverings may form obstructive scar tissue
D) oligodendrocytes produce inhibitory factors that may interfere with regeneration of axons in the CNS
E) absence of endoneurial tube
F) all of the above
