A cell in the peripheral nervous system that is wrapped around a myelinated axon, providing one segment of its myelin sheath

A cell in the peripheral nervous system that is wrapped around a myelinated axon, providing one segment of its myelin sheath

• A. Dendrites
• B. Muscle fiber
• C. Schwann cell
• D. Nucleus

Answer: (C)

In the peripheral nervous system, myelination is carried out by Schwann cells. Each Schwann cell wraps around a single segment of an axon, forming one piece of the myelin sheath that insulates the axon and speeds electrical conduction. The gaps between these wrapped segments are called nodes of Ranvier, where action potentials jump from node to node, boosting transmission speed. Dendrites are neuronal input processes, not glial cells that myelinate. A muscle fiber is an effector cell, not involved in wrapping axons. The nucleus is just an organelle within cells and does not describe the myelinating cell in this context.

In the peripheral nervous system, myelination is carried out by Schwann cells. Each Schwann cell wraps around a single segment of an axon, forming one piece of the myelin sheath that insulates the axon and speeds electrical conduction. The gaps between these wrapped segments are called nodes of Ranvier, where action potentials jump from node to node, boosting transmission speed.

Dendrites are neuronal input processes, not glial cells that myelinate. A muscle fiber is an effector cell, not involved in wrapping axons. The nucleus is just an organelle within cells and does not describe the myelinating cell in this context.