Answer:
Schwann cells
Explanation:
Schwann cells are one of the two types of glial cells present in peripheral nervous systems. Schwann cells surround the axons in PNS and form the myelin sheath around them. One Schwann cell myelinates a single axon. However, one Schwann cell may enclose as many as 20 or more unmyelinated axons that lack a myelin sheath. Myelin sheath refers to the multiple layers of lipid and protein that surrounds some axons. The presence of myelin sheath insulates the axons and increases the speed of nerve impulse conduction.
