Schwann cells are supporting cells of:
**Core Concept**
Schwann cells are a type of glial cell that provides myelination and support to the peripheral nervous system (PNS). They play a crucial role in the development and maintenance of the PNS, facilitating the transmission of nerve impulses.
**Why the Correct Answer is Right**
Schwann cells are responsible for myelinating the axons of peripheral neurons, which increases the speed of nerve conduction. The myelin sheath, formed by Schwann cells, acts as an electrical insulator, allowing the action potential to jump from node to node, thus facilitating faster transmission of nerve impulses. This process is essential for the proper functioning of the PNS.
**Why Each Wrong Option is Incorrect**
**Option A:** Oligodendrocytes are the myelinating cells of the central nervous system (CNS), not the PNS. They are responsible for myelinating CNS neurons, not peripheral neurons.
**Option B:** Astrocytes are a type of glial cell that provides support and maintenance functions to the CNS, but they do not myelinate neurons. They are involved in various functions such as maintaining the blood-brain barrier, regulating ion and water balance, and providing nutrients to neurons.
**Option C:** Microglia are a type of glial cell that acts as the immune cells of the CNS. They are involved in phagocytosis, antigen presentation, and the production of cytokines, but they do not provide myelination to neurons.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that Schwann cells are responsible for myelinating peripheral neurons, which is crucial for the proper functioning of the PNS. This knowledge is vital for understanding various neurological conditions that affect the PNS, such as demyelinating diseases like Guillain-Barré syndrome.
**Correct Answer:** C.