Final answer:
Upon axon regeneration, surviving Schwann cells regenerate axon filaments and tubes (myelin sheaths) to restore proper nerve function.
Step-by-step explanation:
Upon axon regeneration, surviving Schwann cells play an important role in the recovery process. They regenerate axon filaments by producing new axonal material. Schwann cells also regenerate tubes, which are the myelin sheaths that surround the axons in the peripheral nervous system. This helps to restore proper communication between neurons and facilitate nerve function.