Regrowth of a damaged axon can occur more readily in the peripheral nervous system than in the brain because
A) Schwann cells form barriers to axon regrowth.
B) Schwann cells form cylinders through which new axons can grow and reinnervate a target cell nerve cell.
C) Schwann cells generate a chemical signal that instructs nerve cells to die.
D) Astrocytes form cylinders through which new axons can grow and reinnervate a target cell nerve cell.
E) Oligodendroglia form barriers to axon regrowth.

Question

Quizplus · Accepted Answer

Schwann cells in the peripheral nervous system can form a structure called a "bands of Büngner," which forms a cylinder through which new axons can grow and reinnervate a target cell nerve cell. In contrast, astrocytes in the brain do not form such structures, and there is evidence that they can actually inhibit axon regrowth after injury. Schwann cells may also release growth factors that promote axon regrowth.

Regrowth of a Damaged Axon Can Occur More Readily in the Peripheral