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Which cells protect the neurons and help them function?
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4. Tissues & Histology
Introduction to Nervous Tissue
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What cells form the myelin sheaths around nerve fibers in the peripheral nervous system (PNS)?
A
Astrocytes
B
Microglia
C
Schwann cells
D
Oligodendrocytes
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Understand the role of myelin sheaths: Myelin sheaths are insulating layers that surround nerve fibers, which help increase the speed at which electrical impulses propagate along the nerve cells.
Identify the location: The problem specifies the peripheral nervous system (PNS), which is distinct from the central nervous system (CNS). Different types of cells are responsible for myelination in these two systems.
Differentiate between cell types: In the CNS, oligodendrocytes are responsible for forming myelin sheaths. In the PNS, Schwann cells perform this function.
Review the function of Schwann cells: Schwann cells wrap around the nerve fibers in the PNS, creating a myelin sheath that facilitates rapid signal transmission.
Eliminate incorrect options: Astrocytes and microglia are not involved in myelination. Astrocytes provide support and nutrition, while microglia act as immune cells in the CNS.
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