Multiple Choice
What type of conduction takes place in unmyelinated axons?
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4. Tissues & Histology
Introduction to Nervous Tissue
Multiple Choice
Which type of glial cell produces the myelin sheath in the peripheral nervous system (PNS)?
A
Schwann cells
B
Microglia
C
Oligodendrocytes
D
Astrocytes
Verified step by step guidance1
Understand the role of the myelin sheath: The myelin sheath is a protective covering that surrounds axons in the nervous system, facilitating the rapid transmission of electrical signals.
Differentiate between the central and peripheral nervous systems: The central nervous system (CNS) includes the brain and spinal cord, while the peripheral nervous system (PNS) consists of nerves outside the CNS.
Identify the glial cells involved in myelination: In the CNS, oligodendrocytes are responsible for producing the myelin sheath. In the PNS, Schwann cells perform this function.
Review the function of Schwann cells: Schwann cells wrap around axons in the PNS, creating the myelin sheath that insulates and increases the speed of nerve impulse conduction.
Eliminate incorrect options: Microglia are involved in immune defense in the CNS, oligodendrocytes myelinate axons in the CNS, and astrocytes support neurons and maintain the blood-brain barrier in the CNS. Therefore, Schwann cells are the correct answer for the PNS.
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