Multiple Choice
What cells form the myelin sheaths around nerve fibers in the peripheral nervous system (PNS)?
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4. Tissues & Histology
Introduction to Nervous Tissue
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What structure wraps around and insulates the axons of neurons?
A
Dendrites
B
Synaptic cleft
C
Myelin sheath
D
Node of Ranvier
Verified step by step guidance1
Identify the function of the structure in question: The structure that wraps around and insulates axons is responsible for increasing the speed of electrical signal transmission along the neuron.
Understand the role of myelin: Myelin is a fatty substance that forms a sheath around the axons of many neurons, providing insulation and facilitating rapid signal conduction.
Differentiate between the options: Dendrites receive signals, the synaptic cleft is the gap between neurons, and the Node of Ranvier is a gap in the myelin sheath that aids in signal propagation.
Recognize the correct structure: The myelin sheath is the specific structure that wraps around and insulates the axons, enhancing the speed and efficiency of nerve impulse transmission.
Conclude with the correct answer: Based on the function and characteristics, the myelin sheath is the structure that insulates axons, distinguishing it from the other options provided.
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