Myelination in peripheral nervous system is done by
**Core Concept**
Myelination in the peripheral nervous system is a process of insulating nerve fibers with a fatty substance called myelin. This process is crucial for the rapid transmission of nerve impulses. Myelination in the peripheral nervous system is different from that in the central nervous system, where oligodendrocytes are responsible for myelination.
**Why the Correct Answer is Right**
In the peripheral nervous system, myelination is carried out by **Schwann cells**. These cells wrap their plasma membranes around the axons of peripheral nerves, forming multiple layers of myelin. This process is essential for increasing the speed of nerve conduction in the peripheral nervous system. Myelinated nerve fibers have a higher conduction velocity compared to unmyelinated fibers.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not specify the correct cell type responsible for myelination in the peripheral nervous system.
* **Option B:** This option is incorrect as it refers to the central nervous system, where oligodendrocytes are responsible for myelination, not the peripheral nervous system.
* **Option C:** This option is incorrect as it is not a cell type responsible for myelination in the peripheral nervous system.
* **Option D:** This option is incorrect as it is not a cell type responsible for myelination in the peripheral nervous system.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that myelination in the peripheral nervous system is carried out by Schwann cells, and this process is crucial for the rapid transmission of nerve impulses.
**Correct Answer: C. Schwann cells. Schwann cells.**